4-3

#include<stdio.h>

int main(void)

{

         int count,number;

 

         count=0;

         printf("Enter a number:");

         scanf("%d",&number);

         if(number<0)number=-number;

         do{

                   number=number/10;

                   count++;

         }while(number!=0);

         printf("It countains %d digits.\n",count);

 

         return 0;

}