题解 | 牛牛学加法

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        if(0 <= a && a <= 1000 && b >= 0 && b <= 1000){
            int sum = a + b;
            System.out.print(sum);
        }else{
            System.out.print("no use!");
        }
        return;
    }
}