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("它是个"+ count +"位的数!"); }else{ System.out.println("输入有误!"); } } }
public class HelloWorld{ public static void main(String[] args){ int num = 999; int count = 0; for(int i = 0; i <= 999999999;i++){ while(num != 0){ count ++; num /= 10; } } System.out.println("它是个"+ count +"位的数!"); } }