Use of C program to find sum of two numbers using recursion

In this tutorial, we will discuss a concept of use of C program to find the sum of two numbers using recursion

In this article, we are going to learn how to calculate the addition of two numbers using recursion in the C programming language

Program

This program allows the entry of two digits from the user and to find the sum of two numbers using the recursive function in C programming language

#include <stdio.h>
#include <stdlib.h>
int add(int,int);  //Function prototype        
int main()
{
    int x,y,result;  //variable declaration
    printf("enter two numbers: ");
    scanf("%d %d",&x,&y);
     result=add(x,y);//function call
    printf("Sum of two numbers are: %d\n",result);
    getch();
    return 0;
}
int add(int x, int y)     //function declaration(recursive function)
{
    if(y==0)
        return x;
    else
        return(1+add(x,y-1));
}

When the above code is executed, it produces the following results

Enter two numbers: 23
34
sum of two numbers are:57

Method

Declare the three int type variables x,y and result. x and y are used to receive input from the user whereas the result is used to assign the output.
Receive input from the user for x, y to perform addition.
When the function is called, two numbers will be passed as an argument. Subsequently, the sum of the two numbers will be found.
Then, assign the output to the variable result
Display the result on the screen.