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

*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 : :**

- 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
of the function.**recursive call**

- 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 : :**

**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) { sum+=(num%10); //add digit into sum 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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