How to add two numbers in C++

This simple C++ program will add two numbers and display the sum.

#include <iostream>
Using namespace std;

int main() {
    // Declare variables to store the numbers
    double num1, num2, sum;

    //Ask user to enter first number
    cout << "Enter 1st number: ";
    cin >> num1;

    // Ask user to enter second number
    cout << "Enter 2nd number: ";
    cin >> num2;

    // Add the two numbers
    sum = num1 + num2;

    // Display the sum
    cout << "The sum of " << num1 << " and " << num2 << " is " << sum <<     endl;

    return 0;
}

Explanation:

Include the iostream library: This library is used for input and output operations in C++.

#include <iostream>

Main function: The execution of a C++ program begins with the main function.

int main() {
// Code here
return 0;

}

    Declare variables: We declare three variables num1, num2, and sum to store the numbers input by the user and their sum.

double num1, num2, sum;

Prompt the user for input: Using cout, we display a message to the user asking them to input two numbers. We then use cin to read the numbers.

cout << "Enter the first number: ";
cin >> num1;
cout << "Enter the second number: ";
cin >> num2;

Calculate the sum: We add num1 and num2 and store the result in the variable sum.

sum = num1 + num2;

Display the result: Finally, we output the sum using cout.

cout << "The sum of " << num1 << " and " << num2 << " is " << sum << endl;

How to Compile and Run the Program:

1. 1. Save the code in a file with a .cpp extension, for example, add_numbers.cpp.

1. 1. Open a terminal or command prompt.

1. 1. Navigate to the directory where you saved the file.

1. 1. Compile the program using a C++ compiler. For example, if you are using g++, you can compile it with the following command:

g++ -o add_numbers add_numbers.cpp

5. 5. Run the compiled program:

./add_numbers

You will be prompted to enter two numbers, and the program will display their sum.