为什么每次都会提示说中文输入有问题呢
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=num/10;
}
System.out.println("他是个"+count+"数");
}
else{
System.out.println("输入有误");
}