在石头，纸，剪刀中打破for循环 - C [重复]

Question

#include <stdio.h>
#include <stdlib.h> //for random()
#include <time.h>

void RockPaperScissors(char usrVal);

main(){

char input;
int i;
        for (i = 0; i < 3; ++i){
            printf("\nEnter r, p, or s for rock paper scissors: ");
            input = getchar();
            RockPaperScissors(input);
    }
    printf("\n\n\nTHE GAME IS OVER\n\n");
}




void RockPaperScissors(char usrVal){

    const int rock = 0;
    const int paper = 1;
    const int scissors = 2;

    srand(time(NULL));
    int comVal = rand() % 2 + 0;

    int usrScore = 0;
    int comScore = 0;
    int tie = 0;

    switch (usrVal){
            case 'r':
                    if (comVal == paper)
                            printf("\nYOU LOSE!!!\n");
                            ++comScore;
                            break;
                    if (comVal == scissors)
                            printf("\nYOU WIN!!!\n");
                            ++usrScore;
                            break;
            case 'p':
                    if (comVal == rock)
                            printf("\nYOU WIN!!!\n");
                            ++usrScore;  
                            break;
                    if (comVal == scissors)
                            printf("\nYOU LOSE!!!\n");
                            ++comScore;
                            break;
            case 's':
                     if (comVal == rock)
                            printf("\nYOU LOSE!!!\n");
                            ++comScore;
                            break;
                    if (comVal == scissors)
                            printf("\nYOU WIN!!!\n");
                            ++usrScore;
                            break;
            default:
                    printf("\nTIE\n");
                    ++tie;
                     printf("\ncomVal: %d  usrVal: %c\n", comVal, usrVal);


           }

    printf("\nscore is user: %d   computer: %d  Tie: %d \n\n\n\n", usrScore, comScore, tie);
}


 // ISSUES: need way to store score count.. need to fix rando()..sometimes printf() is skipped in switch statement
  //Need to fix the for loop (it does not ask for input every time)

我已经被这个问题困扰了好几个小时。我浏览了多个论坛，并没有发现任何可以真正解释我的问题的东西。程序将进入循环的一次迭代，然后跳过用户输入。但之后它会要求输入。

---

输入 r、p 或 s 表示剪刀石头布：r

得分是用户：0 计算机：1 领带：0

---

输入 r、p 或 s 表示剪刀石头布： 领带

comVal：0 usrVal：

得分是用户：0 计算机：0 领带：1

---

输入 r、p 或 s 表示剪刀石头布：r

得分是用户：0 计算机：1 领带：0

游戏结束

Answer 1

将input = getchar(); 设为scanf("\n%c", &input);。你的问题是 unmanaged \n (new line).\n 也被认为是一个字符。所以你按下的 enter 用于下一个getchar() .

还将main() 设置为int main() （main 应该有一些返回类型通常是 int） 并改进您的代码缩进。（如果您的正在使用int main())

修改后的代码：-

#include <stdio.h>
#include <stdlib.h> //for random()
#include <time.h>

void RockPaperScissors(char usrVal);

int main() // make it int main()
{

        char input;
        int i;
        for (i = 0; i < 3; ++i)
        {
                printf("\nEnter r, p, or s for rock paper scissors: ");
                scanf("\n%c", &input);  // not input = getchar();
                RockPaperScissors(input);
        }
        printf("\n\n\nTHE GAME IS OVER\n\n");
        return 0;
}

void RockPaperScissors(char usrVal)
{

        const int rock = 0;
        const int paper = 1;
        const int scissors = 2;

        srand(time(NULL));
        int comVal = rand() % 2 + 0;

        int usrScore = 0;
        int comScore = 0;
        int tie = 0;

        switch (usrVal)
        {
        case 'r':
                if (comVal == paper)
                        printf("\nYOU LOSE!!!\n");
                ++comScore;
                break;
                if (comVal == scissors)
                        printf("\nYOU WIN!!!\n");
                ++usrScore;
                break;
        case 'p':
                if (comVal == rock)
                        printf("\nYOU WIN!!!\n");
                ++usrScore;
                break;
                if (comVal == scissors)
                        printf("\nYOU LOSE!!!\n");
                ++comScore;
                break;
        case 's':
                if (comVal == rock)
                        printf("\nYOU LOSE!!!\n");
                ++comScore;
                break;
                if (comVal == scissors)
                        printf("\nYOU WIN!!!\n");
                ++usrScore;
                break;
        default:
                printf("\nTIE\n");
                ++tie;
                printf("\ncomVal: %d  usrVal: %c\n", comVal, usrVal);
        }

        printf("\nscore is user: %d   computer: %d  Tie: %d \n\n\n\n", usrScore, comScore, tie);
}