C program for addition of two numbers

In this post, you will learn the addition of two numbers using C program. Such a type of basic program is useful to improve your logic building.

C Program to find sum of two numbers

In the given program, we have asked the user to enter two integers. Then, we have calculated the sum of these two integers using the + operator and displayed it on the screen-

#include <stdio.h>
int main() {

    int num1, num2, sum;

    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);

    // calculating sum
    sum = num1 + num2;

    printf("%d + %d = %d", num1, num2, sum);
    return 0;
}

Enter first number: 52
Enter second number: 245

52 + 245 = 297

C Program to add two numbers using a function

Here, we have created a user-defined function sum() and written the addition logic. We are called this function from the main function.

#include <stdio.h>

// Define function
int sum(int a, int b){
   return a+b;
}
int main()
{
   int num1, num2, total;
   printf("Enter first number: ");
   scanf("%d", &num1);
   printf("Enter second number: ");
   scanf("%d", &num2);

   //Calling the function
   total = sum(num1, num2);
   printf("Sum of the entered numbers: %d", total);
   return 0;
}

Enter first number: 52
Enter second number: 64
Sum of the entered numbers: 116

C Program to add two real numbers

In the given example, we add two real numbers using C programming, that's why we use double data type.

#include <stdio.h>
int main()
{
  double a, b, sum;
 
  printf("Enter two numbers:\n");
  scanf("%lf%lf", &a, &b);

  sum = a + b;
  printf("%lf\n", sum);
 
  return 0;
}

Enter two numbers:
23.22 53.23
76.450000

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