app.py

import streamlit as st
import math

# Streamlit app title
st.title("Scientific Calculator")

# User input for numbers and operation
st.subheader("Enter your inputs:")

# Input fields
number1 = st.number_input("Enter the first number:", value=0.0)
operation = st.selectbox(
    "Choose an operation:",
    ["Addition (+)", "Subtraction (-)", "Multiplication (×)", "Division (÷)", 
     "Power (^)", "Square Root (√)", "Logarithm (log)", "Sine (sin)", 
     "Cosine (cos)", "Tangent (tan)"]
)

# Perform the calculation based on the operation selected
result = None

if operation in ["Addition (+)", "Subtraction (-)", "Multiplication (×)", "Division (÷)", "Power (^)"]:
    number2 = st.number_input("Enter the second number:", value=0.0)
    if operation == "Addition (+)":
        result = number1 + number2
    elif operation == "Subtraction (-)":
        result = number1 - number2
    elif operation == "Multiplication (×)":
        result = number1 * number2
    elif operation == "Division (÷)":
        if number2 != 0:
            result = number1 / number2
        else:
            st.error("Division by zero is not allowed.")
    elif operation == "Power (^)":
        result = number1 ** number2

elif operation == "Square Root (√)":
    if number1 >= 0:
        result = math.sqrt(number1)
    else:
        st.error("Square root of a negative number is not defined.")
elif operation == "Logarithm (log)":
    if number1 > 0:
        base = st.number_input("Enter the base (default is 10):", value=10.0)
        if base > 0 and base != 1:
            result = math.log(number1, base)
        else:
            st.error("Base must be positive and not equal to 1.")
    else:
        st.error("Logarithm of non-positive numbers is not defined.")
elif operation == "Sine (sin)":
    result = math.sin(math.radians(number1))
elif operation == "Cosine (cos)":
    result = math.cos(math.radians(number1))
elif operation == "Tangent (tan)":
    result = math.tan(math.radians(number1))

# Display the result
if result is not None:
    st.subheader("Result:")
    st.write(result)