这样不对吗
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num>=0&&num<=999999999){
do{
count++;
num/=10;
}while(num!=0);
System.out.println("它是个"+count+"位的数");
}else{
System.out.println("输入有误");
}
}
}