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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