Java编程——两个数相加，判断是否出现错误

import java.util.Random;
import java.util.Scanner;

public class demo2 {
    public static void main(String[] args) {
        Random rd = new Random();
        int num1 = rd.nextInt(100);
        int num2 = rd.nextInt(100);
        int num3 = num1+num2;
        System.out.println("算式是："+num1+"+"+num2);
        System.out.println("请输出结果是：");
        Scanner input = new Scanner(System.in);
        int num4 = input.nextInt();
        String result = num3==num4?"yes!":"no!";
        System.out.println(result);
    }
}

代码运行如下：