为什么要运行的错误,感叹号也是用的中文啊
public class HelloWorld{public static void main(String[] args){int num = 999;int count = 0; if(num>=0&&num<=999999999){ while(num!=0){ count++; num/=10; } System.out.println("它是个"+count+"位的数!"); }else{ System.out.println("输入有误!"); } }}