public class HelloWorld{
public static void main(String[] args){
long num = 999;
int count = 1;
while( num / 10 != 0 && count<=10){
count +=1;
num /= 10;
}
if(count>=10){
System.out.println("重新输");
}else
System.out.println("它是个"+count+"位的数");
}
}
求个更短的
