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import streamlit as st
def add(a, b):
if not isinstance(a, (int, float)) or not isinstance(b, (int, float)):
return "Invalid input: Please enter only numbers."
return a + b
def subtract(a, b):
if not isinstance(a, (int, float)) or not isinstance(b, (int, float)):
return "Invalid input: Please enter only numbers."
return a - b
def multiply(a, b):
if not isinstance(a, (int, float)) or not isinstance(b, (int, float)):
return "Invalid input: Please enter only numbers."
return a * b
def divide(a, b):
if not isinstance(a, (int, float)) or not isinstance(b, (int, float)):
return "Invalid input: Please enter only numbers."
if b == 0:
return "Error: Division by zero"
return a / b
def exponentiation(a, b):
if not isinstance(a, (int, float)) or not isinstance(b, (int, float)):
return "Invalid input: Please enter only numbers."
return a ** b
def square_root(a):
if not isinstance(a, (int, float)):
return "Invalid input: Please enter only numbers."
if a < 0:
return "Error: Square root of negative number not possible."
return a ** 0.5
st.title("Advanced Functional Calculator")
# Clear layout using columns
col1, col2 = st.columns(2)
# Input fields
first_number = col1.number_input("Enter first number", key="first_number")
second_number = col2.number_input("Enter second number (optional)", key="second_number")
# Buttons with descriptions
add_button = st.button("Add", key="add_button")
subtract_button = st.button("Subtract", key="subtract_button")
multiply_button = st.button("Multiply", key="multiply_button")
divide_button = st.button("Divide", key="divide_button")
exp_button = st.button("Exponentiation", key="exp_button")
sqrt_button = st.button("Square Root", key="sqrt_button")
# Robust input validation and calculation based on buttons
if add_button:
result = add(first_number, second_number)
if isinstance(result, str): # Display error message if validation failed
st.error(result)
else:
st.write("Result:", result)
elif subtract_button:
result = subtract(first_number, second_number)
if isinstance(result, str):
st.error(result)
else:
st.write("Result:", result)
elif multiply_button:
result = multiply(first_number, second_number)
if isinstance(result, str):
st.error(result)
else:
st.write("Result:", result)
elif divide_button:
result = divide(first_number, second_number)
if isinstance(result, str):
st.error(result)
else:
st.write("Result:", result)
elif exp_button:
result = exponentiation(first_number, second_number)
if isinstance(result, str):
st.error(result)
else:
st.write("Result:", result)
elif sqrt_button:
result = square_root(first_number)
if isinstance(result, str):
st.error(result)
else:
st.write("Result:", result)
# History using SessionState
session_state = st.session_state
if "calc_history" not in session_state:
session_state.calc_history = []
# Update history on each calculation
if result and not isinstance(result, str):
session_state.calc_history.append(f"{first_number} {add_button.text if add_button else '', subtract_button.text if subtract_button else '', multiply_button.text if multiply_button else '', divide_button.text if divide_button else '', exp_button.text if exp_button else '', sqrt_button.text if sqrt_button else ''} {second_number} = {result}")
# Display history
if session_state.calc_history:
st.subheader("Calculation History:")
for entry in session_state.calc_history:
st.write(entry)
# Customization options
st.subheader("Customization:")
font_size = st.number_input("Font size", min_value=10, max_value=20, value=16, key="font_size")
st.write("Current font size:", font_size)
primary_color = st.color_picker("Primary color", key="primary_color")
st.write("Current primary color:", primary_color)
# Update layout based on customization
st.markdown(f"<style>.stApp {{ font-size: {font_size}px; color: {primary_color}; }}</style>", unsafe_allow_html=True)
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