在C中输入Enter键时,从while循环中摆脱出来

问题描述

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

#define BAR 1
#define BELL 2
#define LEMON 3
#define CHERRY 4
#define RMAX 4

void main()
{
    int slot1,slot2,slot3;
    char anykey;

    while (1)
    {
        printf("Type any key to start the slot machine \n");
        scanf(" %c",&anykey);
        if (anykey == '\n')
        {
            break;
        }
        srand(time(NULL));
        slot1 = 1 + (int)rand() % RMAX;
        slot2 = 1 + (int)rand() % RMAX;
        slot3 = 1 + (int)rand() % RMAX;

        if (slot1 == slot2 && slot2 == slot3 && slot1 == 1)
            printf("Congradulations On A JACKPOT\n");
        else if (slot1 == 1 || slot2 == 1 || slot3 == 1)
            printf("ONE dime \n");
        else if (slot2 == slot1 && slot2 == slot3)
            printf("One Nickel \n");
        else printf("Sotrry better luck next time\n");
    }
}

我做了这样的代码,我想从while循环中摆脱出来 按下输入键 所以我添加代码(anykey=='\n'),但它不起作用 我的代码有什么问题

解决方法

scanf(" %c",&anykey);在实际读取任何字符之前会消耗stdin中的换行符,这就是anykey从未真正以\n结束的原因

如果必须将换行符作为中断条件(如按回车键将停止程序),则最好使用getchar,可以使用scanf("%c",...),但这有点过度杀伤力。

printf("Type any key to start the slot machine \n");
int ch = getchar();
/* Should check for `EOF` too */
if (ch == '\n' || ch == EOF)
{
    break;
}
anykey = (char) ch;