public class HelloWorld{
public static void main(String[] args){
int num = 999;
int count = 0;
if ((num >= 0)&&(num <= 1000000000)){
??? for(;num < 10;count++){
??? for(;num < 10;){
??????? num = num/10;
??? }
??? }
}
System.out.println("它是個"+count+"位的數！");
}
}