Java程序从两个随机数的和中获取所需的输入

Question

我想制作一个小程序，通过添加两个随机数来获得所需的结果。例如，我们想要的数字是 30，那么随机的第 1 个和第 2 个应该是 15-15、13-17、10-20 或其他任何值。我制作了这个程序，它显示随机数的总和，但不是所需的总和。

import java.util.*;
import java.util.Random;

public class Problem {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Random rand = new Random();
        Random random = new Random();
        int r = rand.nextInt(100) + 1;
        int r1 = random.nextInt(100) + 1;

        int sum = r + r1;
        System.out.println(r + " + " + r1 + " sum is: " + sum);
    }
}

解决了。

import java.util.*;
 import java.util.Random;
 public class Problem { 
public static void main(String[] args) {    

    Scanner sc= new Scanner(System.in);
    Random rand= new Random(); 
      Random random= new Random();
     int r= rand.nextInt(100)+1;
      int n=0;
      int sum= sc.nextInt();
      n= sum-r;
       sum= r+n;

     System.out.println(r +" + "+n+ " sum is: " + sum);  
   } 
}

Answer 1

我认为您正在寻找这个:

Scanner sc = new Scanner(System.in);
int n = sc.nextInt();

Random rand = new Random();
int r1 = rand.nextInt(n) + 1; // only one random number is needed
int r2 = n-r1; // other will be subtract of n and r1

System.out.println(r1 + " + " + r2 + " sum is: " + n);