c - 我如何避免在这里使用 goto 语句？

Question

我是 C 语言编程的新手，我正在制作一个简单的基于骰子的游戏。我有所有其他逻辑工作，但我无法看到如何避免 goto 语句。基本上，玩家以 50 美元作为余额开始，程序要求下注，然后掷骰子，根据掷骰的结果，会发生不同的事情。主要问题是当结果发生时，系统会询问用户是否要再次玩，如果他们说不，我就退出，但如果他们说是，我需要回到开始并再次要求下注。

int main()
{

        START:

    if (FirstRun == 0)
    {
        printf("Your starting balance is $%.2f", Balance);
    }
    if (FirstRun > 0)
    {
        printf("Your new balance is $%.2f", Balance);
    }
    if (Balance <= 0)
    {
        printf("Sorry you are out of money!");
        exit(0);
    }

    do
    {
        ValidBet = 0;
        printf("\nPlease enter your bet:");
        scanf("%lf", &Bet);

        if ((Bet > Balance) || (Bet < 0))
        {
            printf("Your bet is invalid, try again.");
        }
        else 
        {
            ValidBet = 1;
        }
    } while (ValidBet == 0);

    ThrowDicePair();
    printf("DICE #1 WAS %d", SumOfThrows);

    if (SumOfThrows == 7 || SumOfThrows == 11)
    {
        Balance += Bet;
        printf("You win! Would you like to play again? [y/n]");
        C = getch();
        if (C == 'y')
        {
            FirstRun++;
            goto START;
        }
        else if (C == 'n')
        {
            printf("Thanks for playing");
            exit(0);
        }

}

Answer 1

只需将所有内容放入 for(;;) 循环中即可； goto 将是您重新循环的情况，在其他情况下添加 return 0;(或 exit(0); 根据您的喜好并且在某些情况下已经使用)

int main()
{

  for (;;) { /* ADDED  */
    if (FirstRun == 0)
    {
        printf("Your starting balance is $%.2f", Balance);
    }
    if (FirstRun > 0)
    {
        printf("Your new balance is $%.2f", Balance);
    }
    if (Balance <= 0)
    {
        printf("Sorry you are out of money!");
        exit(0);
    }

    do
    {
        ValidBet = 0;
        printf("\nPlease enter your bet:");
        scanf("%lf", &Bet);

        if ((Bet > Balance) || (Bet < 0))
        {
            printf("Your bet is invalid, try again.");
        }
        else 
        {
            ValidBet = 1;
        }
    } while (ValidBet == 0);

    ThrowDicePair();
    printf("DICE #1 WAS %d", SumOfThrows);

    if (SumOfThrows == 7 || SumOfThrows == 11)
    {
        Balance += Bet;
        printf("You win! Would you like to play again? [y/n]");
        C = getch();
        if (C == 'y')
        {
            FirstRun++;
            /* goto START; removed */
        }
        else if (C == 'n')
        {
            printf("Thanks for playing");
            exit(0);
        }
        else /* ADDED */
          return 0; /* ADDED */
    }
    else /* ADDED */
      return 0; /* ADDED */
  } /* ADDED  */
}

在更复杂/嵌套的情况下，您可以使用continue 来重新循环，但在这里这是无用的