public?class?HelloWorld{
public?static?void?main(String[]?args){
???int?num?=?999;
???int?count?=?0;
if(num?>=0?&&?num?<=999999999){
???????while(num?!=0){
???????????num?/=?10;
???????????count++;
???????}
???????System.out.println("它是個(gè)"?+?count?+?"位的數(shù)!");
}
}
}