Simple Calculator Simulation in C++

In this exercise, you will create a C++ program that simulates a basic calculator. The calculator will perform simple arithmetic operations such as addition, subtraction, multiplication, and division. The user will input two numbers and choose the operation they wish to perform.

Iterative Logic

1. Input Handling

The program captures two numerical values (double) and a character (char) representing the mathematical operator.

2. Switch Control

A switch statement evaluates the operator. It efficiently routes the logic to the matching case block.

3. Error Validation

Includes a specific check for division by zero and a default case to handle unrecognized operators.

Objective

1. Ask the user to input two numbers.
2. Prompt the user to select an operation (addition, subtraction, multiplication, or division).
3. Use a switch statement to handle the operations and perform the calculation.
4. Display the result and handle division by zero errors.

Example C++ Exercise

simple_calculator.cpp Switch Case

#include <iostream> // Include the iostream library for input and output

using namespace std; // Use the standard namespace

// Main function - the entry point of the program
int main() {
    double num1, num2; // Variables to store the two numbers
    char operation; // Variable to store the selected operation

    // Ask the user for input
    cout << "Enter first number: ";
    cin >> num1; // Read the first number

    cout << "Enter second number: ";
    cin >> num2; // Read the second number

    // Ask the user to choose an operation
    cout << "Enter operation (+, -, *, /): ";
    cin >> operation; // Read the chosen operation

    // Switch statement to handle different operations
    switch (operation) {
        case '+':
            cout << "Result: " << num1 + num2 << endl; // Addition
            break;
        case '-':
            cout << "Result: " << num1 - num2 << endl; // Subtraction
            break;
        case '*':
            cout << "Result: " << num1 * num2 << endl; // Multiplication
            break;
        case '/':
            // Check if division by zero is attempted
            if (num2 != 0) {
                cout << "Result: " << num1 / num2 << endl; // Division
            } else {
                cout << "Error: Division by zero is not allowed." << endl; // Handle division by zero
            }
            break;
        default:
            cout << "Invalid operation." << endl; // Handle invalid operation input
    }

    return 0; // Return 0 to indicate that the program executed successfully
}

Console Output:

Enter first number: 10
Enter second number: 5
Enter operation (+, -, *, /): +
Result: 15

Flow Control & Loops

Objective

Example C++ Exercise

Console Output:

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