Code Editor for app.py

import streamlit as st
import numpy as np

st.title("Simple Calculator")

# Create a container for the calculator
calc_container = st.container()

with calc_container:
    # Two columns for input values
    col1, col2 = st.columns(2)
    
    with col1:
        num1 = st.number_input("First Number", value=0.0)
    
    with col2:
        num2 = st.number_input("Second Number", value=0.0)
    
    # Operation selection
    operation = st.selectbox(
        "Select Operation",
        ["Addition", "Subtraction", "Multiplication", "Division", "Power", "Square Root", "Sine", "Cosine", "Tangent", "Logarithm"]
    )
    
    # Calculate button
    calculate = st.button("Calculate")
    
    # Result container
    result_container = st.container()
    
    if calculate:
        if operation == "Addition":
            result = num1 + num2
            expression = f"{num1} + {num2}"
        elif operation == "Subtraction":
            result = num1 - num2
            expression = f"{num1} - {num2}"
        elif operation == "Multiplication":
            result = num1 * num2
            expression = f"{num1} × {num2}"
        elif operation == "Division":
            if num2 == 0:
                result = "Error: Division by zero"
                expression = f"{num1} ÷ {num2}"
            else:
                result = num1 / num2
                expression = f"{num1} ÷ {num2}"
        elif operation == "Power":
            result = num1 ** num2
            expression = f"{num1}^{num2}"
        elif operation == "Square Root":
            if num1 < 0:
                result = "Error: Cannot calculate square root of negative number"
                expression = f"√{num1}"
            else:
                result = np.sqrt(num1)
                expression = f"√{num1}"
        elif operation == "Sine":
            result = np.sin(num1)
            expression = f"sin({num1})"
        elif operation == "Cosine":
            result = np.cos(num1)
            expression = f"cos({num1})"
        elif operation == "Tangent":
            result = np.tan(num1)
            expression = f"tan({num1})"
        elif operation == "Logarithm":
            if num1 <= 0:
                result = "Error: Cannot calculate logarithm of non-positive number"
                expression = f"log({num1})"
            else:
                result = np.log(num1)
                expression = f"log({num1})"
        
        with result_container:
            st.write("### Result")
            if isinstance(result, str):
                st.error(result)
            else:
                st.success(f"{expression} = {result}")
                
                # Display LaTeX for mathematical expression
                latex_expression = ""
                if operation == "Addition":
                    latex_expression = f"{num1} + {num2} = {result}"
                elif operation == "Subtraction":
                    latex_expression = f"{num1} - {num2} = {result}"
                elif operation == "Multiplication":
                    latex_expression = f"{num1} \\times {num2} = {result}"
                elif operation == "Division":
                    latex_expression = f"{num1} \\div {num2} = {result}"
                elif operation == "Power":
                    latex_expression = f"{num1}^{{{num2}}} = {result}"
                elif operation == "Square Root":
                    latex_expression = f"\\sqrt{{{num1}}} = {result}"
                elif operation == "Sine":
                    latex_expression = f"\\sin({num1}) = {result}"
                elif operation == "Cosine":
                    latex_expression = f"\\cos({num1}) = {result}"
                elif operation == "Tangent":
                    latex_expression = f"\\tan({num1}) = {result}"
                elif operation == "Logarithm":
                    latex_expression = f"\\log({num1}) = {result}"
                
                st.latex(latex_expression)
                
# History section
st.write("---")
st.write("### History")
st.write("Recent calculations will appear here.")

# Add information about the calculator
st.write("---")
st.write("### About This Calculator")
st.write("""
This simple calculator supports basic arithmetic operations and some mathematical functions:
- Addition, Subtraction, Multiplication, Division
- Power calculation
- Square Root
- Trigonometric functions (Sin, Cos, Tan)
- Logarithm (natural log)

For trigonometric functions and logarithm, only the first number input is used.
""")