By | 28.11.2016

# Sum of N natural numbers using recursion

Write a C Program to find Sum of N natural numbers using recursion. Here’s simple Program to find Sum of N natural numbers using recursion in C Programming Language.

## Recursion : :

• Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
• The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
• Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Here is the source code of the C Program to find Sum of N natural numbers using recursion. The C Program is successfully compiled and run on a Windows system. The program output is also shown below.

### SOURCE CODE : :

```/*  C Program to find Sum of N natural numbers using recursion  */

#include<stdio.h>

int sum(int);

int main()
{
int n, s;

printf("Enter the value of N :: ");
scanf("%d", &n);

s= sum(n);

printf("\nThe Sum of [ 1 + ... + %d ] numbers is :: %d\n",n,s);

return 0;
}

int sum(int x)
{
if(x==0)
return(0);

else
return(x + sum(x-1));
}```

### OUTPUT : :

```/*  C Program to find Sum of numbers 1 to N using recursion  */

Enter the value of N :: 10

The Sum of [ 1 + ... + 10 ] numbers is :: 55

Process returned 0```

Above is the source code for C Program to find Sum of N natural numbers using recursion which is successfully compiled and run on Windows System.The Output of the program is shown above .

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