Addition of 2 Numbers using Function: C Program

In this video tutorial lets learn how to add two integer numbers using functions in C programming language.

Related Read:
Function / Methods In C Programming Language
Addition of 2 Numbers: C

Video Tutorial: Addition of 2 Numbers using Function: C Program

Source Code: Addition of 2 Numbers using Function: C Program

#include<stdio.h>

int add(int, int); // function prototype

int main()
{
    int a, b;

    printf("Enter 2 integer numbers\n");
    scanf("%d%d", &a, &b);

    //function call add(a, b);
    printf("%d + %d = %d\n", a, b, add(a, b));

    return 0;
}

//function definition
int add(int x, int y)
{
    return(x+y);
}

Output 1
Enter 2 integer numbers
25
25
25 + 25 = 50

Output 2
Enter 2 integer numbers
50
5
50 + 5 = 55

Here we call user defined function add from within printf() function. We pass 2 integer variables as argument to add method. The values of variable a and b are copied to variable x and y. Note that values of variable x and y are local to function add and main function do not know values of x and y. x and y are separate copy and altering which do not alter the value of variables a and b.

a and b are called actual arguments.
x and y are called formal arguments.

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