java作业

import java.util.InputMismatchException;import java.util.Scanner;public class MyTest { public static void main(String[] args) { System.out.println("请输入一个数：");Scanner input = new Scanner(System.in);int num = 0;try { num = input.nextInt();} catch (InputMismatchException ime) { System.out.println("输入的不是一个数字！");} int result = 0;for (int i = 0;i <= num;i++) { result += i;} System.out.println("结果是:"+ result);}} 收起