# Write a C program to calculate sum of digits using recursion

By | 28.11.2016

## Calculate sum of digits using recursion

Write a C program to calculate sum of digits using recursion. Here’s simple program to calculate sum of digits 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 calculate sum of digits 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 calculate sum of digits using recursion  */

#include <stdio.h>

//function to calculate sum of all digits
int sumDigits(int num)
{
static int sum=0;
if(num>0)
{
sumDigits(num/10);
}
else
{
return sum;
}
}
int main()
{
int number,sum;

printf("Enter any number :: ");
scanf("%d",&number);

sum=sumDigits(number);

printf("\nSum of all digits of %d are :: %d\n",number,sum);

return 0;
}```

### Output : :

```/*  C program to calculate sum of digits using recursion  */

Enter any number :: 123456

Sum of all digits of 123456 are :: 21

Process returned 0```

Above is the source code for C program to calculate sum of digits using recursion which is successfully compiled and run on Windows System.The Output of the program is shown above .

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