public?class?HelloWorld{
????public?static?void?main(String[]?args){
????????int?num?=?999;????????
????????int?count?=?0;????????
????????if(num%1000000000==num&&num!=0){????????????
????????????for(int?i=1;?i<1000000000;?i=i*10){????????????????
????????????????if(num%i==num){????????????????????
????????????????????break;????????????????
????????????????}????????????????
????????????count++;????????????
????????????}????????????
????????????System.out.println("它是個"+count+"位的數！");????????
????????}else?if(num==0){????????????
????????????System.out.println("它是個1位數的數！");????????
????????}else{????????????
????????????System.out.println("數字超出判斷范圍");
????????}
????}
}