Question

我为游戏编写了一个模拟用户和计算机滚动游戏的代码，获胜者从失败者那里获得1美元，每个游戏以2美元开头。代码运行正常，但是当用户或计算机达到0 $时，它并没有像我预期的那样结束。有什么建议吗？

import java.util.Scanner;

public class ALE_04_RollDice {
public static void main (String[] args) {

    Scanner input = new Scanner(System.in);
    int userMoney = 2;
    int compMoney = 2;
    int userRoll = (int) (1 + Math.random() * 6);
    int compRoll = (int) (1 + Math.random() * 6);

    System.out.print("Press 'r' if you would like to roll ");
    do {String roll = input.nextLine();
    if (roll.equals("r")); {
        if (userRoll > compRoll){
            userMoney++;
            compMoney--;
     System.out.print("The computer rolled " + compRoll + " and you rolled "       + userRoll + ". you won."
        + "\n" + "You have $" + userMoney + " & The computer has $" + compMoney);
            }

            else if (userRoll < compRoll) {
                compMoney++;
                userMoney--;
                System.out.print("The computer rolled " + compRoll + " and you rolled " + userRoll + 
                        ". you lost" + "\n" + "You have $" + userMoney + " & The computer has $" + compMoney);
            }

            else {System.out.print("The computer rolled " + compRoll + "and you rolled " + userRoll + 
                    ". it's a tie" + "\n" + "You have $" + userMoney + " & the computer has $" + compMoney);}


            }
            }while (userMoney >= 0 || compMoney >=0);
    }}

Answer 1

你的while语句正在测试＆lt; = 0，但最初两个变量都是＆gt; 0. while循环永远不会触发。

Answer 2

首先你有一个问题，你的条件金钱值= 2为球员和comp，所以虽然永远不会解雇..修复那你可以使用一个做什么

do{
    statement(s) //block of statements
}while (Boolean expression);

所以在你的do{}里面你可以得到你的陈述和条件......所以它会在这些大括号内做任何事情，直到满足while()内的条件

例如

class DoWhileLoopExample {
    public static void main(String args[]){
         int i=10;
         do{
              System.out.println(i);
              i--;
         }while(i>1);
    }
}

Answer 3

您希望在小于或等于但是大于或等于时停止。

    while (userMoney >= 0 || compMoney >=0) {

Answer 4

问题原因：

您的while循环根本不运行，因为内部条件最初被评估为false。

  while (userMoney <= 0 || compMoney <=0)

这是：当用户有小于或等于0的钱时，或者当计算机有小于或等于0的钱时，然后运行while循环，这将永远不会是真的，因为他们都是计算机并且用户都以$ 2开头，因此userMoney == 2和compMoney == 2.

解决方案：

将while循环的条件更改为以下内容：

 while(userMoney>0 || compMoney>0)

然后添加一个if语句，说明compMoney == 0或者userMoney == 0，然后跳出while循环。

 if(userMoney == 0 || compMoney == 0){
     break;
}

Answer 5

您在while语句中使用的条件不正确。您正在测试是否有任何播放器具有＆gt; = 0这将始终测试为true并导致无限循环。而是测试 BOTH 玩家是否> 0并且如果没有则结束游戏。

你也有一个＆＃39 ;;＆＃39;在你之后如果声明。这将导致其后的代码一直执行。

这是完整的工作代码：

public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
int userMoney = 2;
int compMoney = 2;
int userRoll = (int) (1 + Math.random() * 6);
int compRoll = (int) (1 + Math.random() * 6);

System.out.print("Press 'r' if you would like to roll ");
do {String roll = input.nextLine();
if (roll.equals("r")) {
    if (userRoll > compRoll){
        userMoney++;
        compMoney--;
 System.out.print("The computer rolled " + compRoll + " and you rolled "       + userRoll + ". you won."
    + "\n" + "You have $" + userMoney + " & The computer has $" + compMoney);
        }

        else if (userRoll < compRoll) {
            compMoney++;
            userMoney--;
            System.out.print("The computer rolled " + compRoll + " and you rolled " + userRoll + 
                    ". you lost" + "\n" + "You have $" + userMoney + " & The computer has $" + compMoney);
        }

        else {System.out.print("The computer rolled " + compRoll + "and you rolled " + userRoll + 
                ". it's a tie" + "\n" + "You have $" + userMoney + " & the computer has $" + compMoney);}


        }
         //prompt user to type 'r' to roll again
        System.out.println("\n\nPress 'r' if you would like to roll ");
        }while (userMoney > 0 && compMoney >0);

        System.out.println("\n\nGAME OVER!!!");
    }
   }
//end main

if / else语句在while循环中

5 个答案:

问题原因：

解决方案：