Find Number Of Digits In A Number

/*

 * C Program to find number of digits in a number.

 * Pre-Condition : Program needs to be written without using any library function.

 * Example       : If number is 1234 - output will be 4.

 */

// Include

#include <stdio.h>

// Declarations

/* getNumberOfDigits

 * Description : A function that gives number of digits in a given number.

 * Parameters  : i_number is the number of which number of digits needs to be found.

 * Return      : unsigned int data which is number of digits.

 */

unsigned int getNumberOfDigits(int i_number);

// Definitions

int main()

{

    int i_number;

    printf("Enter number of which number of digits needs to find : ");

    scanf("%d",&i_number);

    printf("Number of digits in %d : %u\n",i_number,getNumberOfDigits(i_number));

}

unsigned int getNumberOfDigits(int i_number)

{

    unsigned int count = 0;

    // As long as i_number does not become 0 - repeat

    while (i_number)

    {

        count++;

        i_number/=10;   // reduce the number by 1 digit

    }

    

    return count;

}