Q:

# C program to count digits of a number using recursion

In this C program, we are going to learn how to count total number of digits of a number using recursion?

Given an integer number and we have to count the digits using recursion using C program.

In this program, we are reading an integer number and counting the total digits, here countDigits() is a recursion function which is taking number as an argument and returning the count after recursion process.

Example:

```    Input number: 123
Output:
Total digits are: 3```

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## Program to count digits in C using recursion

``````/*C program to count digits using recursion.*/

#include <stdio.h>

//function to count digits
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 a positive integer number: ");
scanf("%d",&number);

count=countDigits(number);

printf("Total digits in number %d is: %d\n",number,count);

return 0;
}``````

Output

```Enter a positive integer number: 123
Total digits in number 123 is: 3 ```

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