#include 
using namespace std;

int main() {
    char op;
    float num1, num2;
    
    cout << "Enter operator (+, -, *, /): ";
    cin >> op;
    
    cout << "Enter two numbers: ";
    cin >> num1 >> num2;
    
    switch(op) {
        case '+':
            cout << num1 << " + " << num2 << " = " << num1 + num2;
            break;
        case '-':
            cout << num1 << " - " << num2 << " = " << num1 - num2;
            break;
        case '*':
            cout << num1 << " * " << num2 << " = " << num1 * num2;
            break;
        case '/':
            if (num2 != 0)
                cout << num1 << " / " << num2 << " = " << num1 / num2;
            else
                cout << "Error! Division by zero.";
            break;
        default:
            cout << "Error! Invalid operator.";
    }
    
    return 0;
}
    

1. What is C++ Calculator Program?

The C++ Calculator Program is a simple console application that performs basic arithmetic operations including addition, subtraction, multiplication, and division. It demonstrates fundamental programming concepts in C++.

2. How Does the Calculator Work?

The calculator program uses switch-case statements to handle different arithmetic operations:

switch(operator) {
    case '+': result = num1 + num2; break;
    case '-': result = num1 - num2; break;
    case '*': result = num1 * num2; break;
    case '/': 
        if (num2 != 0) result = num1 / num2;
        else result = "Division by zero error";
        break;
    default: result = "Invalid operator";
}
                    

Key Features:

• Input validation for numbers
• Error handling for division by zero
• Support for basic arithmetic operations
• Clear output formatting

3. Importance of Calculator Programs

Educational Value: Calculator programs are excellent for learning programming fundamentals including variables, input/output operations, conditional statements, and basic arithmetic operations in C++.

4. Using the Calculator

Instructions: Enter two numbers, select an operator (+, -, *, /), and click Calculate. The program will display the result of the arithmetic operation.

5. Frequently Asked Questions (FAQ)

Q1: What programming concepts does this calculator demonstrate?
A: This program demonstrates variables, input/output operations, switch-case statements, conditional logic, and basic error handling.

Q2: Can I extend this calculator with more operations?
A: Yes, you can add more cases to the switch statement for additional operations like modulus, exponentiation, or square roots.

Q3: How do I handle decimal inputs?
A: The program uses float data type which supports decimal numbers. You can enter numbers with decimal points.

Q4: What happens if I divide by zero?
A: The program includes error handling that detects division by zero and displays an appropriate error message.

Q5: Can I make a graphical version of this calculator?
A: Yes, you can create a GUI version using libraries like Qt, wxWidgets, or Windows Forms for a more user-friendly interface.