Code Line
stringclasses 57
values | User Explanation
stringclasses 692
values | Line-Explanation in PCEX
stringclasses 131
values | Annotation Score
float64 1
5
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do {
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The code in the body of the do will first execute and continue to execute while the while function is true.
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We need to process the digits of the integer from right to left and print them.
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do {
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The code in the body of the do will first execute and continue to execute while the while function is true.
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Therefore, we need to use a loop structure.
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do {
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The code in the body of the do will first execute and continue to execute while the while function is true.
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In this program, we do this by using a do loop.
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do {
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The code in the body of the do will first execute and continue to execute while the while function is true.
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The do loop is more appropriate than a while loop because a positive integer always has at least one digit which results in the body of the loop performing at least once.
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} while (num > 0);
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This is the continuation test.
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We need to check for termination conditions to avoid infinite loops.
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} while (num > 0);
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This is the continuation test.
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The loop should terminate when we run out of digits to process.
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} while (num > 0);
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This is the continuation test.
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We could check whether the are more digits left by checking whether the variable num, which gets updated in the body of the do loop, is greater than zero.
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} while (num > 0);
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This is the continuation test.
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If variable num is greater than zero, then it must have at least one digit, and in that case, the body of the do loop will be repeated again.
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} while (num > 0);
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This is the continuation test.
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The body of the while loop should repeat as long as there are more digits left that we have not processed yet.
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} while (num > 0);
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This is what drives the loop.
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We need to check for termination conditions to avoid infinite loops.
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} while (num > 0);
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This is what drives the loop.
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The loop should terminate when we run out of digits to process.
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} while (num > 0);
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This is what drives the loop.
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We could check whether the are more digits left by checking whether the variable num, which gets updated in the body of the do loop, is greater than zero.
| 1 |
} while (num > 0);
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This is what drives the loop.
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If variable num is greater than zero, then it must have at least one digit, and in that case, the body of the do loop will be repeated again.
| 1 |
} while (num > 0);
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This is what drives the loop.
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The body of the while loop should repeat as long as there are more digits left that we have not processed yet.
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} while (num > 0);
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As long as the number doesn't reduce to 0 , we keep running this loop.
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We need to check for termination conditions to avoid infinite loops.
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} while (num > 0);
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As long as the number doesn't reduce to 0 , we keep running this loop.
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The loop should terminate when we run out of digits to process.
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} while (num > 0);
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As long as the number doesn't reduce to 0 , we keep running this loop.
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We could check whether the are more digits left by checking whether the variable num, which gets updated in the body of the do loop, is greater than zero.
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} while (num > 0);
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As long as the number doesn't reduce to 0 , we keep running this loop.
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If variable num is greater than zero, then it must have at least one digit, and in that case, the body of the do loop will be repeated again.
| 2 |
} while (num > 0);
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As long as the number doesn't reduce to 0 , we keep running this loop.
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The body of the while loop should repeat as long as there are more digits left that we have not processed yet.
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} while (num > 0);
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The loop is terminated once all the digits have been printed and the number reduces to 0.
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We need to check for termination conditions to avoid infinite loops.
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} while (num > 0);
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The loop is terminated once all the digits have been printed and the number reduces to 0.
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The loop should terminate when we run out of digits to process.
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} while (num > 0);
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The loop is terminated once all the digits have been printed and the number reduces to 0.
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We could check whether the are more digits left by checking whether the variable num, which gets updated in the body of the do loop, is greater than zero.
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} while (num > 0);
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The loop is terminated once all the digits have been printed and the number reduces to 0.
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If variable num is greater than zero, then it must have at least one digit, and in that case, the body of the do loop will be repeated again.
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} while (num > 0);
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The loop is terminated once all the digits have been printed and the number reduces to 0.
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The body of the while loop should repeat as long as there are more digits left that we have not processed yet.
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System.out.println(num % 10);
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This line prints out what right most integer of the current num by using the modulus function.
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Each printed digit is followed by the line separator (e.g. '\n') at the end.
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System.out.println(num % 10);
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This line prints out what right most integer of the current num by using the modulus function.
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We need to extract the last digit in the 1's position of the integer.
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System.out.println(num % 10);
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This line prints out what right most integer of the current num by using the modulus function.
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For example, if the integer is 1234, we want to extract the digit 4 that is in 1's position of the integer.
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System.out.println(num % 10);
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This line prints out what right most integer of the current num by using the modulus function.
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We do this by calculating the remainder of the division of the integer by 10.
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System.out.println(num % 10);
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This line prints out what right most integer of the current num by using the modulus function.
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Then, this statement prints the last digit of the integer to the standard output stream.
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int num = 1234;
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This saves the integer, whose digits will be printed from right to left, in a variable called num.
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We need variable num to store the integer that we want to print its digits.
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num = num / 10;
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This will update the new num by removing the right most digit of the current num.
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Therefore, this division will remove the digit that we processed (lastDigit) and we can move on to the next digit.
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num = num / 10;
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This will update the new num by removing the right most digit of the current num.
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We truncate the extracted digit that we processed from the original integer by dividing the integer by 10.
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num = num / 10;
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This will update the new num by removing the right most digit of the current num.
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Note that this statement performs an integer division because both operand of the / operator are integer.
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} while (num > 0);
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This allows the code in the do body to execute while num is greater than 0.
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We need to check for termination conditions to avoid infinite loops.
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} while (num > 0);
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This allows the code in the do body to execute while num is greater than 0.
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The loop should terminate when we run out of digits to process.
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} while (num > 0);
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This allows the code in the do body to execute while num is greater than 0.
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We could check whether the are more digits left by checking whether the variable num, which gets updated in the body of the do loop, is greater than zero.
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} while (num > 0);
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This allows the code in the do body to execute while num is greater than 0.
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If variable num is greater than zero, then it must have at least one digit, and in that case, the body of the do loop will be repeated again.
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} while (num > 0);
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This allows the code in the do body to execute while num is greater than 0.
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The body of the while loop should repeat as long as there are more digits left that we have not processed yet.
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Scanner scan = new Scanner(System.in);
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We created a scanner object, which is the object required to take input from user.
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To read the input values from the user, we need to define a Scanner object.
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Scanner scan = new Scanner(System.in);
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We created a scanner object, which is the object required to take input from user.
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We need to read and process the values that the user enters.
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Scanner scan = new Scanner(System.in);
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This creates a Scanner object called scan so that it could be used to retrieve data from user input.
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To read the input values from the user, we need to define a Scanner object.
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Scanner scan = new Scanner(System.in);
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This creates a Scanner object called scan so that it could be used to retrieve data from user input.
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We need to read and process the values that the user enters.
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System.out.println("Enter the phone age in years:");
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This prints out: "Enter the phone age in years:" so that the user will know what to enter.
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We prompt the user to enter the phone age in years.
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System.out.println("Enter the phone age in years:");
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We print output on the screen with the message "Enter the phone age in years", asking the user to input phone age.
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We prompt the user to enter the phone age in years.
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int phoneAge = scan.nextInt();
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This saves the user input in a variable called phone age so that the program can test whether its time to get a new phone.
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We read the phone age by calling the nextInt() method because this input is an integer.
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int phoneAge = scan.nextInt();
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This saves the user input in a variable called phone age so that the program can test whether its time to get a new phone.
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We need to read the phone age that the user enters and store it in a variable.
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System.out.println("Enter whether the phone is broken (true or false):");
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This prints out "Enter whether the phone is broken (true or false):" so that the user knows what to enter.
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We prompt the user to enter whether the phone is broken.
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int phoneAge = scan.nextInt();
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We initialize an integer variable named phoneAge, and scan the user input and store it in it.
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We read the phone age by calling the nextInt() method because this input is an integer.
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int phoneAge = scan.nextInt();
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We initialize an integer variable named phoneAge, and scan the user input and store it in it.
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We need to read the phone age that the user enters and store it in a variable.
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boolean isBroken = scan.nextBoolean();
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This scans the new input that the user just submitted and saves it into a boolean variable called isBroken.
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We need to read whether the phone is broken and store it in a variable.
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boolean isBroken = scan.nextBoolean();
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This scans the new input that the user just submitted and saves it into a boolean variable called isBroken.
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The variable isBroken is true when the phone is broken, and false otherwise.
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boolean isBroken = scan.nextBoolean();
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This scans the new input that the user just submitted and saves it into a boolean variable called isBroken.
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We read whether the phone is broken by calling the nextBoolean() method because this input is a boolean.
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scan.close();
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This closes the scan object since it will no longer be used.
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We close the scanner as we do not want to process any input from the user in the rest of the program.
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System.out.println("Enter whether the phone is broken (true or false):");
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We print message to the user, asking to enter whether the phone has been broken or not.
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We prompt the user to enter whether the phone is broken.
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System.out.println("Enter whether the phone is broken (true or false):");
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The input should be either True or False.
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We prompt the user to enter whether the phone is broken.
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boolean isBroken = scan.nextBoolean();
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we declare a Boolean variable isBroken and scan the user input and store it in this variable.
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We need to read whether the phone is broken and store it in a variable.
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boolean isBroken = scan.nextBoolean();
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we declare a Boolean variable isBroken and scan the user input and store it in this variable.
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The variable isBroken is true when the phone is broken, and false otherwise.
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boolean isBroken = scan.nextBoolean();
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we declare a Boolean variable isBroken and scan the user input and store it in this variable.
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We read whether the phone is broken by calling the nextBoolean() method because this input is a boolean.
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boolean needPhone = isBroken || phoneAge >= 3;
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This will save true to the variable needPhone if either the phone is 3 or more years old or if the user entered true if the phone is broken, else it will save needPhone as false.
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We use the || operator (called or) to combine the two conditions.
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boolean needPhone = isBroken || phoneAge >= 3;
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This will save true to the variable needPhone if either the phone is 3 or more years old or if the user entered true if the phone is broken, else it will save needPhone as false.
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The first condition is to test if the phone is broken and the second condition is to test if the phone age is at least 3 years old.
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boolean needPhone = isBroken || phoneAge >= 3;
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This will save true to the variable needPhone if either the phone is 3 or more years old or if the user entered true if the phone is broken, else it will save needPhone as false.
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We need two conditions to determine if it is the time for a new phone.
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scan.close();
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After we are done taking input, we close the scanner object using this line.
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We close the scanner as we do not want to process any input from the user in the rest of the program.
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System.out.println(needPhone);
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This prints out true or false based on the information given to the program by the user.
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This statement prints true/false depending on whether it is time to buy a new phone.
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System.out.println(needPhone);
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This prints out true or false based on the information given to the program by the user.
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The printed value is followed by an end-of-line character in the end.
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boolean needPhone = isBroken || phoneAge >= 3;
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if the phone is broken or age is more than 3 then bolean true will be stored in the variable.
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We use the || operator (called or) to combine the two conditions.
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boolean needPhone = isBroken || phoneAge >= 3;
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if the phone is broken or age is more than 3 then bolean true will be stored in the variable.
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The first condition is to test if the phone is broken and the second condition is to test if the phone age is at least 3 years old.
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boolean needPhone = isBroken || phoneAge >= 3;
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if the phone is broken or age is more than 3 then bolean true will be stored in the variable.
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We need two conditions to determine if it is the time for a new phone.
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Scanner scan = new Scanner(System.in);
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We create a scanner object named scan.
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To read the input value from the user, we need to define a Scanner object.
| 3 |
Scanner scan = new Scanner(System.in);
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We create a scanner object named scan.
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We need to read and process the integer that the user enters.
| 2 |
Scanner scan = new Scanner(System.in);
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It will be used to take input from user.
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To read the input value from the user, we need to define a Scanner object.
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Scanner scan = new Scanner(System.in);
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It will be used to take input from user.
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We need to read and process the integer that the user enters.
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System.out.println("Enter an integer: ");
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We print to the user interface, "Enter an integer" asking the user to input an integer.
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We prompt the user to enter an integer.
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int num = scan.nextInt();
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the scanner object scans the number as a string, reading one character at a time and converting it to an integer, using the method nextInt() and storing the result in the integer variable num.
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We read the input integer by calling the nextInt() method because this input is an integer.
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int num = scan.nextInt();
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the scanner object scans the number as a string, reading one character at a time and converting it to an integer, using the method nextInt() and storing the result in the integer variable num.
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We need to read the integer that the user enters and store it in a variable.
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scan.close();
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We then close the scanner object.
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We close the scanner as we do not want to process any input from the user in the rest of the program.
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scan.close();
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No more input needed.
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We close the scanner as we do not want to process any input from the user in the rest of the program.
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if ( num > 0 ) {
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Beginning of an if statement , if num is greater than 0 then the code enclosed by if will be terminated.
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If the integer is neither positive nor negative, then we could conclude that the integer is zero.
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if ( num > 0 ) {
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Beginning of an if statement , if num is greater than 0 then the code enclosed by if will be terminated.
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The conditions that tests for the integer's sign are mutually exclusive (i.e., one and only one of the conditions can be true); therefore, their order does not matter.
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if ( num > 0 ) {
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Beginning of an if statement , if num is greater than 0 then the code enclosed by if will be terminated.
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To determine the sign of the integer, we need to perform two tests: one for determining whether the integer is positive and one for determining whether the integer is negative.
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if ( num > 0 ) {
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Beginning of an if statement , if num is greater than 0 then the code enclosed by if will be terminated.
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Also, it is better to use if-else if statements instead of sequential if statements because an integer has only one sign and once we find the sign, we don't need to perform more tests.
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if ( num > 0 ) {
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Beginning of an if statement , if num is greater than 0 then the code enclosed by if will be terminated.
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If both of these tests fail, then we could conclude that the integer is zero.
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System.out.println("The integer is positivie.");
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Once meeting the if criteria, this line of code prints to the user "The integer is positive" .
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This statement prints that the integer is positive.
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System.out.println("The integer is positivie.");
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Once meeting the if criteria, this line of code prints to the user "The integer is positive" .
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The printed text is followed by the end-of-line character at the end.
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} else if ( num < 0 ) {
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If the if criteria is not met, then the else if criteria is checked, that is , if the num is less than 0.
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If the first test fails (i.e., when the integer is not positive), we need to test if the integer is negative.
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System.out.println("The integer is negative.");
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if the else if criteria is met, the this line prints to the user, "The integer is negative".
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The printed text is followed by the end-of-line character at the end.
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System.out.println("The integer is negative.");
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if the else if criteria is met, the this line prints to the user, "The integer is negative".
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This statement prints that the integer is negative.
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System.out.println("The integer is negative.");
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if the else if criteria is met, the this line prints to the user, "The integer is negative".
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The printed text is followed by the end-of-line character at the end.
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System.out.println("The integer is negative.");
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if the else if criteria is met, the this line prints to the user, "The integer is negative".
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This statement prints that the integer is negative.
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} else {
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if none of the criteria meets then the code enclosed by else is executed, that is , it prints to the user "The integer is zero" .
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We need to end the above if-else if statements with an else statement that its body is executed when none of the above tests are true, that is when the integer is zero.
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} else {
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if none of the criteria meets then the code enclosed by else is executed.
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We need to end the above if-else if statements with an else statement that its body is executed when none of the above tests are true, that is when the integer is zero.
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System.out.println("The integer is zero.");
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If none of the criteria meets, then this line prints to the user "The integer is zero".
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The printed text is followed by the end-of-line character at the end.
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System.out.println("The integer is zero.");
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If none of the criteria meets, then this line prints to the user "The integer is zero".
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This statement prints that the integer is zero.
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int [] arr = { 1, 2, 3};
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we declare an integer array, with its elements initialized.
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We initialize the array of type int to hold the specified numbers.
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int [] arr = { 1, 2, 3};
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we declare an integer array, with its elements initialized.
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We initialize the array by separating elements with a comma and enclosing the collection in braces { }.
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int [] arr = { 1, 2, 3};
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Namely 1,2 and 3.
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We initialize the array of type int to hold the specified numbers.
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int [] arr = { 1, 2, 3};
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Namely 1,2 and 3.
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We initialize the array by separating elements with a comma and enclosing the collection in braces { }.
| 1 |
for ( int i = 0; i < arr.length; i++ ) {
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It's a for loop.
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We want to iterate over the array and increment each element in the array by 1.
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for ( int i = 0; i < arr.length; i++ ) {
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It's a for loop.
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To really change the array as we march across it, we need to use indexes so we can assign an updated value to each position as we go.
| 1 |
for ( int i = 0; i < arr.length; i++ ) {
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It's a for loop.
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We need the array indexes to start at 0 (array indexes start from 0) with every integer number up to but not including the array length.
| 1 |
for ( int i = 0; i < arr.length; i++ ) {
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The loop starts with the iteration variable value as 0 and runs as long as the its value is less than the length of the array length, incrementing it's value by 1 each time because of i++ .
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We want to iterate over the array and increment each element in the array by 1.
| 4 |
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