public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
for (;(num/=10)>0;count ++);
System.out.println("它是个"+ (count+1)+"位的数!");
public static void main(String[] args){
int num = 999;
int count = 0;
for (;(num/=10)>0;count ++);
System.out.println("它是个"+ (count+1)+"位的数!");