Algorithm Gossip: Craps赌博游戏

说明

一个简单的赌博游戏，游戏规则如下：玩家掷两个骰子，点数为1到6，如果第一次点数和为7或11，则玩家胜，如果点数和为2、3或12，则玩家输，如果和为其它点数，则记录第一次的点数和，然后继续掷骰，直至点数和等于第一次掷出的点数和，则玩家胜，如果在这之前掷出了点数和为7，则玩家输。

解法

规则看来有些複杂，但是其实只要使用switch配合if条件判断来撰写即可，小心不要弄错胜负顺序即可。

实作

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define WON 0
#define LOST 1
#define CONTINUE 2

int rollDice() { 
    return (rand() % 6) + (rand() % 6) + 2;
}

int main(void) {
    int firstRoll = 1;
    int gameStatus = CONTINUE;
    int die1, die2, sumOfDice;
    int firstPoint = 0;
    char c;

    srand(time(0));

    printf("Craps赌博游戏，按Enter键开始游戏****");

    while(1) {
         getchar();

        if(firstRoll) {
            sumOfDice = rollDice();
            printf("\n玩家掷出点数和：%d\n", sumOfDice);

            switch(sumOfDice) {
                case 7: case 11:
                    gameStatus = WON; break;
                case 2: case 3: case 12:
                    gameStatus = LOST; break;
                default:
                    firstRoll = 0;
                    gameStatus = CONTINUE;
                    firstPoint = sumOfDice;
                    break;
            }
        }
        else {
            sumOfDice = rollDice();
            printf("\n玩家掷出点数和：%d\n", sumOfDice);

            if(sumOfDice == firstPoint)
                gameStatus = WON;
            else if(sumOfDice == 7)
                gameStatus = LOST;
        }

        if(gameStatus == CONTINUE)
            puts("未分胜负，再掷一次****\n");
        else {
            if(gameStatus == WON)
                puts("玩家胜");
            else
                puts("玩家输");

            printf("再玩一次？");
            scanf("%c", &c);
            if(c == 'n') {
                puts("游戏结束");
                break;
            }
                
            firstRoll = 1;
        }
    }

    return 0;
}

Java

import java.io.*; 

public class Craps { 
    public static void main(String[] args) 
                                   throws IOException { 
        final int WON = 0, LOST = 1, CONTINUE = 2; 
        boolean firstRoll = true; 
        int gameStatus = CONTINUE; 
        int die1, die2, sumOfDice; 
        int firstPoint = 0; 
        
        System.out.print(
                 "Craps赌博游戏，按Enter键开始游戏****"); 

        while(true) { 
            System.in.read(); 

            if(firstRoll) { 
               sumOfDice = rollDice(); 
               System.out.println(
                         "\n玩家掷出点数和：" + sumOfDice); 

               switch(sumOfDice) { 
                    case 7: case 11: 
                        gameStatus = WON; break; 
                    case 2: case 3: case 12: 
                        gameStatus = LOST; break; 
                    default: 
                        firstRoll = false; 
                        gameStatus = CONTINUE; 
                        firstPoint = sumOfDice; 
                        break; 
                } 
            } 
            else { 
                sumOfDice = rollDice(); 
                System.out.println(
                         "\n玩家掷出点数和：" + sumOfDice); 

                if(sumOfDice == firstPoint) 
                    gameStatus = WON; 
                else if(sumOfDice == 7) 
                    gameStatus = LOST; 
            } 

            if(gameStatus == CONTINUE) 
                System.out.println("未分胜负，再掷一次****"); 
            else { 
                if(gameStatus == WON) 
                    System.out.println("玩家胜"); 
                else 
                    System.out.println("玩家输"); 

                System.out.print("再玩一次？"); 
                if(System.in.read() == 'n') { 
                    System.out.println("游戏结束"); 
                    break; 
                } 
                
                firstRoll = true; 
            } 
        } 
    } 

    public static int rollDice() { 
        int roll = ((int)(Math.random() * 6) + 
                    (int)(Math.random() * 6)); 

        if(roll < 2) {
            roll = 2;
        }

        return roll;
    } 
}