大家帮我看一下实在找不出问题,else是红波浪线
package com.imooc;
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!");