Count Digits of a Number using C program

/* C program to count digits in a number.*/

#include <stdio.h>

int main()
{
    int num, tNum, cnt;

    printf("Enter a number: ");
    scanf("%d", &num);

    cnt = 0;
    tNum = num;

    while (tNum > 0) {
        cnt++;
        tNum /= 10;
    }

    printf("Total numbers of digits are: %d in number: %d.", cnt, num);

    return 0;
}

Using User Define Function

/* C program to count digits in a number.*/

#include <stdio.h>

/*function to count digits*/
int countDigits(int num)
{
    int count = 0;
    while (num > 0) {
        count++;
        num /= 10;
    }
    return count;
}

int main()
{
    int num, tNum, cnt;

    printf("Enter a number: ");
    scanf("%d", &num);

    cnt = countDigits(num);

    printf("Total numbers of digits are: %d in number: %d.", cnt, num);

    return 0;
}

Output:

    Enter a number: 28765
    Total numbers of digits are: 5 in number: 28765.