package Practice;

public class IfWhileElse {

public static void main(String[] args) {

// TODO Auto-generated method stub

int num = 1;

//定義了一個(gè)整型變量num 并賦初始值為1

int count = 0;

//定義了一個(gè)整型變量count并賦初始值0

if (num >= 0? && num<=999999999){

//判斷num大于等于0與num小于等于999999999是否為ture

while(num != 0){

//num不等于0循環(huán){}中的語句

count++;

//? num每次除于10count就每次加1

num=num/10;

}

System.out.println("它是個(gè)"+ count+"位的數(shù)！");

} else{

System.out.println("輸入有誤！");

}

}

}