当尝到总和 4、5、6、8、9 或 10 时，函数 play_game 不起作用

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函数 rand_num 返回 sum，如果 sum 为 7 或 11，则第一次显示为 win，如果为 2、3 或 12，则第一次显示为失败，该步骤正常工作。 当我们有 4、5、6、8、9 和 10 时，问题就来了。如果是，它打印它并请求一个新的随机变量，如程序所示。 // 程序模拟掷骰子游戏

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 6

// function declation

void play_game (int sum); // function for producing the numbers
int rand_num (void); // function for producing the random dice

// function main

int main ()
{
    int sum;

       // seed random number generaton

    srand((unsigned) time(NULL));

    sum = rand_num();
    play_game (sum);
    return 0;   
 }

 // function for producing the random number of the dice and calculating the sum of the dice

 int rand_num ()
 {
    int sum, dice1, dice2;

    dice1 = 1 + (rand() % SIZE);
    dice2 = 1 + (rand() % SIZE);
    sum = dice1 + dice2;
    return sum;
 }

// function for playing the game craps

void play_game (int sum)
{
    // for the first roll of the dice
    char command;

    do {

// condition for winning for the first roll

    if (sum == 7 || sum == 11){
        printf ("You rolled %d\n", sum);
        printf ("You win!\n");
        printf ("\nPlay again ?  'Y' or 'N'\n");
        scanf ("%c", &command);
    }

// condition for lossing for the first roll 

    else if (sum == 2 || sum == 3 || sum == 12){
        printf ("You rolled %d\n", sum);
        printf ("You loss!\n");
        printf ("Play again ?  'Y' or 'N'\n");
        scanf ("%c", &command);
    }

// condition for winning for the second roll

    else if (sum == 4 || sum == 5 || sum == 6 || sum == 8 || sum == 9 || sum == 10){
        printf ("You rolled %d\n", sum);
        printf ("Your point is %d\n", sum);

        int sum1 = rand_num();           // request new random variable

        while (sum1 != 7 && sum1 != sum){   // 
        printf ("You rolled %d", sum1);

        int sum1 = rand_num ();           // request new random variable

       }
       if (sum1 == 7)
        printf ("You loss!\n");

       else if (sum1 == sum){

        printf ("You win!\n");
        printf ("Play again ?  'Y' or 'N'\n");
        scanf ("%c", &command);
       }
    }
}while (command == 'y' || command == 'Y');

}

Answer 1

问题出在这部分代码；

while (sum1 != 7 && sum1 != sum){   // 
        printf ("You rolled %d", sum1);

        int sum1 = rand_num ();           // request new random variable

       }

当您确定 sum1 不会是 7 并且 sum1 不等于 sum 时，您应该使用 printf。但是在这个while循环中，没有精确性。所以，你必须使用'if'来检查它。

while (sum1 != 7 && sum1 != sum){   //
    if(sum1 != sum || sum1 !=7){
    printf ("You rolled %d", sum1);
    break;
    }
    int sum1 = rand_num ();           // request new random variable

   }