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("它是個(gè)"+count+"位的數(shù)!");
}
else{
??? System.out.println("輸入有誤！");
}
}
}