Question

刚开始学习函数并且很好地掌握它们，这要归功于我发布的帖子Passing variable through switch statement with functions。

创建骰子游戏这样做我遇到了麻烦。看起来它应该比我提出的上一个问题更容易，但事实并非如此。我无法通过函数传递三个随机骰子。另外，正如预期的那样，我最后的if语句不起作用，但我不知道为什么。这是我目前的立场。提前抱歉我讨厌的菜单名称

    #include<stdlib.h>
    #include<stdio.h>
    #include <time.h>
    #include <ctype.h>

    #define MAXROLLS 5
    #define LOWERBOUND 1
    #define UPPERBOUND 6
    #define PAUSE system("pause")

    int diceOne, diceTwo, diceThree;
    int currentDiceSum=0, totalDiceSum=0;
    int quit= 0;
    int count = 0;





    char menuChoice ()
    {

    char choice;

    printf("\n\n==============================================================================\n");
    printf("\n\n==  W E L C O M E     T O     M Y     D I  C E     R O L L I N G     G A M E==\n");
    printf("\n\n==============================================================================\n");
    printf("\n Roll the dice, but you only get 5 rolls! You can't play forever, you know. \n");

    printf("Main Menu\n");
    printf("A.Roll the Dice\n");
    printf("B.Display the Result of Last Roll\n");
    printf("C.Quit\n");


    printf("Enter your choice:   ");
    scanf(" %c", &choice);
    choice = toupper(choice);

}


int rollTheDice() 
{
    int diceOne = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
    int diceTwo = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
    int diceThree = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
    srand((unsigned)time(NULL));



    return diceOne;
    return diceTwo;
    return diceThree;



}


int getDiceRoll()
{

    currentDiceSum = diceOne + diceTwo + diceThree;
    totalDiceSum+= currentDiceSum;
}


int quitTotal()
{

   totalDiceSum+= currentDiceSum;


}

int main()
{


     while(quit!=1) //begin menu loop
    {
        char menu;



        menu = menuChoice();
        switch(menu)
        {
            case 'A':
            {
                 rollTheDice();
                 printf("Dice are rolled!\n");
                 count++;
                 printf("You have %i rolls left.\n", MAXROLLS - count);
                 break;
            }


            case 'B':

               getDiceRoll();  
               printf("Dice 1: %d\n", diceOne);

               printf("Dice 2: %d\n", diceTwo);

               printf("Dice 2: %d\n", diceThree);

               printf("Dice Total: %d\n", currentDiceSum);

            break;
            case 'C':
              quitTotal();
               printf("Number of rolls: %d\n", count);

               printf("Total of all dice for all rolls: %d\n", totalDiceSum);

               printf("Goodbye, hope to see you again!!!\n");
               PAUSE;
               quit = 1;
                break;
            default:
                printf("Please enter A,B,C\n");
                break;
        } //end switch
    } // end loop


if (count == MAXROLLS)

{

    printf("Sorry, your rolls are up!!!\n");


    printf("Your final roll was:\n");

    printf("Dice 1: %d\n", diceOne);

    printf("Dice 2: %d\n", diceTwo);

    printf("Dice 3: %d\n", diceThree);

    currentDiceSum = diceOne + diceTwo + diceThree;

    printf("Your final dice sum was\n");
    printf("Dice Total: %d\n", currentDiceSum);

    totalDiceSum+= currentDiceSum;



    printf("Number of rolls: %d\n", count);
    printf("Total of all dice for all rolls: %d\n", totalDiceSum);
    printf("Goodbye, hope to see you again!!!\n");



}

} //end function

截至目前，我处于迷失状态。我相信每个函数我只能返回一个结果。那么也许我需要为每个骰子创建三个独立的函数？

Answer 1

按如下方式更改您的功能：

typedef struct{
  int diceOne;
  int diceTwo;
  int diceThree;
}DiceRolls;

DiceRolls rollTheDice() 
{
  DiceRolls dice;

  dice.diceOne = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
  dice.diceTwo = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
  dice.diceThree = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
  return dice;
}

根据以下评论，建议在初始化期间仅对srand()进行一次调用。

Answer 2

在C中，函数只能返回一个值。因为diceOne的返回首先出现，所以从rollTheDice（）返回diceOne。如果你只是想让它工作并且不想打扰结构或任何东西，我会在你的变量声明之前删除“int”以将值赋给全局变量而不是创建新的本地变量vaiables，导致rollTheDice（）看起来像这样：

int rollTheDice() 
{
    diceOne = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
    diceTwo = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
    diceThree = LOWERBOUND + rand() % (UPPERBOUND - LOWERBOUND + 1);
    srand((unsigned)time(NULL));
}

随机骰子游戏使用功能

2 个答案: