Write a function named "count digits” in C which count the digits of a given number using
recursion.
Test Data:
Input: 540
Output: 3
Answers
Answer:
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
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
Explanation:
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Answer:
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