w3resource logo
C Programming Exercises

C Exercises: Count the digits of a given number

C Recursion : Exercise-5 with Solution

Write a program in C to count the digits of a given number using recursion.

Sample Solution:

C Code:

#include<stdio.h>

int noOfDigits(int n1);
int main()
{
  int n1,ctr;
    printf("\n\n count the digits of a given number :\n");
	printf("-----------------------------------------\n");
    printf(" Input  a number : ");
    scanf("%d",&n1);

    ctr = noOfDigits(n1);

    printf(" The number of digits in the number is :  %d \n\n",ctr);
    return 0;
}

int noOfDigits(int n1)
{
    static int ctr=0;

     if(n1!=0)
     {
          ctr++;
         noOfDigits(n1/10);
    }

    return ctr;
}

Sample Output:

 count the digits of a given number :                                                                         
-----------------------------------------                                                                     
 Input  a number : 50                                                                                         
 The number of digits in the number is :  2 

Flowchart:

Flowchart: Count the digits of a given number.

C Programming Code Editor:

Improve this sample solution and post your code through Disqus.