C Program to Count number of digits in number without using mod operator

Problem Statement : Write a C Program to Find the Number of Digits in an entered number ?

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#include<stdio.h>
#include<string.h>
void main()
{
int num,digits;
char ch[10];

printf("nEnter the Number : ");
scanf("%d",&num);

sprintf(ch,"%d",num);

digits = strlen(ch);

printf("nNumber of Digits : %d",digits);

getch();
}

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Output:

Enter the Number : 1234
Number of Digits : 4