例4-3

#include<stdio.h>
int main(void)
{
    int count,number;
     
    count=0;
    scanf_s("%d",&number);
    if(number<0)number=-number;
    do{
        number=number/10;
        count++;
    }while(number !=0);
    printf("It contains %d digits.
",count);

    return 0;
}