By | 28.11.2016

# Count number of digits using recursion

Write a C program to Count number of digits using recursion. Here’s simple program to Count number 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.

## Problem : :

Here is the source code of the C program to Count number 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 Count number of digits using recursion  */

#include <stdio.h>

int countDigits(int num)
{
static int count=0;

if(num>0)
{
count++;
countDigits(num/10);
}
else
{
return count;
}
}

int main()
{
int number;
int count=0;

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

count=countDigits(number);

printf("\nTotal number of digits in [ %d ] are :: %d\n",number,count);

return 0;
}```

### Output : :

```/*  C program to Count number of digits using recursion  */

Enter any number :: 12345678

Total number of digits in [ 12345678 ] are :: 8

Process returned 0```

Above is the source code for C Program to Count number 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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Category: C Programming Recursion Programs Tags:  