嵌套循环代码
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！");
}
(*这代码错在哪呢?)
