掷骰子程序

Question

我已经整理了这个程序的一般意义，我只需要“更小或更大”部分的帮助，这使得它无法完成。我知道“”是不可行的；那是一个占位符，直到我知道该放什么。我应该放两行吗？一种用于“=”或其他方法？

问题：

编写一个掷骰子的程序（但对玩家隐藏数字），然后让用户输入一个 1 - 6 范围内的数字。如果玩家输入的计算机掷出的数字相同，那么玩家将获得 10 美元。如果玩家输入的数字小于或大于 1，则玩家将获得 3 美元。如果玩家输入的数字小于或大于 2，则玩家将获得 1 美元。玩家必须支付 3 美元才能玩一次。制作 MatchDice 游戏。提示：使用 Math.random() 方法计算随机值。

我的代码：

import java.util.*;

public class RollDice {

public static void main(String[] args)
{
    Scanner scanner = new Scanner(System.in);
    Random dice = new Random();

    // Generate the random number, between 1 and 6
    int randomValue = (int)(Math.random()*6) + 1;
    int dealerValue = (int)(Math.random()*6) + 1;

    System.out.println("Dealer rolled a dice and here is your turn.");
    System.out.print("Enter a number : ");
    int randomValue = input.nextInt();

    if(randomValue == dealerValue)
        System.out.println("Dealer's number was " + randomValue);
        System.out.println("You won $10 ");
    else if(randomValue == dealerValue <==> 1)
        System.out.println("Dealer's number was " + randomValue);
        System.out.println("You won $3 ")
    else if(randomValue == dealerValue <==> 2)
        System.out.println("Dealer's number was " + randomValue);
        System.out.println("You won $1 );
    else
        System.out.println("You lost $3 ");
}
}

Answer 1

使用Math.abs(a - b)，其中a 是用户号，b 是……好吧，你知道的。

更新

这是完整的解决方案，已修复错误并将重复次数降至最低。

import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
    static Random rnd = new Random();

    static int dice() {
        return rnd.nextInt(6) + 1;
    }

    public static void main(String[] args) throws IOException
    {
        BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

        int dealerValue = dice();

        System.out.print(
            "Dealer rolled a dice and here is your turn.\n" +
            "Enter a number: ");

        int userValue = Integer.parseInt(input.readLine());

        int difference = Math.abs(randomValue - userValue);

        int profit =
            difference == 0 ? 10 :
            difference == 1 ? 3 :
            difference == 2 ? 1 :
            -3;

        System.out.println("Dealer's number was " + dealerValue);
        System.out.println("You " + ((profit >= 0) ? "won" : "lost") + " $" + Math.abs(profit));
    }
}

Answer 2

首先，您需要在条件语句中添加大括号。这段代码甚至无法编译！

if(randomValue == dealerValue) {
    System.out.println("Dealer's number was " + randomValue);
    System.out.println("You won $10 ");
}
else if(Math.abs(randomValue - dealerValue) == 1) {
    System.out.println("Dealer's number was " + randomValue);
    System.out.println("You won $3 ")
}
else if(Math.abs(randomValue - dealerValue) == 2) {
    System.out.println("Dealer's number was " + randomValue);
    System.out.println("You won $1 );
}
else
    System.out.println("You lost $3 ");

“else”不需要大括号，因为它只包含一个表达式。 编辑： 我忘记了这个问题 - 您可以计算随机值和选定值之间差异的绝对值，并检查它是等于一还是二。

Answer 3

可能你想写这样的东西：

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    // Generate the random number, between 1 and 6
    int dealerValue = (int)(Math.random()*6) + 1;

    System.out.println("Dealer rolled a dice and here is your turn.");
    System.out.print("Enter a number : ");
    int inputValue = scanner.nextInt();

    if(inputValue == dealerValue) {
        System.out.println("Dealer's number was " + dealerValue);
        System.out.println("You won $10 ");
    }
    else if(Math.abs(dealerValue - inputValue) == 1) {
        System.out.println("Dealer's number was " + dealerValue);
        System.out.println("You won $3 ");
    }
    else if(Math.abs(dealerValue - inputValue) == 2) {
        System.out.println("Dealer's number was " + dealerValue);
        System.out.println("You won $1 ");
    }
    else {
        System.out.println("Dealer's number was " + dealerValue);
        System.out.println("You lost $3 ");
    }

}

你根本不需要 dice 变量，因为你不使用它。你也不需要用随机数初始化两个变量，一个就足够了。