这为什么不对啊?
public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if(num>0&&num<=999999999)
{
while(num!=0)
{
count+=1;
num/=10;
}
System.out.println("它是个"+count+"位的数!");
}
else
{
System.out.println("输入有误");
}
}
}