In this example, we will ask users to input two integer numbers and display the sum of these numbers.

To understand this example you should have a basic understanding of C Language topics such as Operators, Inputs & Outputs, Variables, and Data types.

#Program to add two numbers

Below is the complete program but don’t look at it now as we will understand it steps by step.

#include <stdio.h>

int main() {
  int num1, num2, sum;

  printf("Enter the first number: ");
  scanf("%d", &num1);

  printf("Enter the second number: ");
  scanf("%d", &num2);

  sum = num1 + num2;
  printf("The sum of %d and %d is %d\n", num1, num2, sum);

  return 0;
}

#Sample Output

Enter the first number: 5
Enter the second number: 10
The sum of 5 and 10 is 15

#Step 1: Write the basic C Program

First, create a new C program file and write the basic C code to get started, as given below.

#include <stdio.h>

int main() {
  // your code here
  return 0;
}

#Step 2: Declare the variables

int num1, num2, sum;

These are the variables you will use in your program. num1 and num2 are the two numbers that you want to add, and sum will store the result of the addition.

#Step 3: Get the numbers from the user

#Get the first number

printf("Enter the first number: ");
scanf("%d", &num1);

The printf function displays the prompt “Enter the first number: ” on the screen. The scanf function is used to read the input from the user and store it in the num1 variable. The & symbol is used to pass the address of the num1 variable to scanf, so that scanf can store the input in that location.

#Get the second number

printf("Enter the second number: ");
scanf("%d", &num2);

This is similar to the previous step, except that the prompt is “Enter the second number: ” and the input is stored in the num2 variable.

#Step 4: Add the two numbers

sum = num1 + num2;

This line adds the values stored in num1 and num2 and stores the result in the sum variable.

#Step 5: Display the result

printf("The sum of %d and %d is %d\n", num1, num2, sum);

This line uses the printf function to display the result of the addition. The %d is a placeholder for an integer value, and the values of num1, num2, and sum are printed in the corresponding order. The \n at the end is a special character that represents a new line, so the output will be displayed on a new line.

Your complete program should look like this

#include <stdio.h>

int main() {
  int num1, num2, sum;

  printf("Enter the first number: ");
  scanf("%d", &num1);

  printf("Enter the second number: ");
  scanf("%d", &num2);

  sum = num1 + num2;
  printf("The sum of %d and %d is %d\n", num1, num2,

Happy Coding/:)