c - C 程序中的字母猜谜游戏，错误混淆

Question

我正在尝试使用 Visual Studio 2012 用 C 语言做一个字母猜谜游戏，但我不断收到错误和警告，并且不知道如何修复它们。我不断收到的错误是:

1.)警告 1 警告 C4133:“function”:不兼容的类型 - 从“FILE *”到“const char *”

2.)警告 2 警告 C4047:“=”:“FILE *”与“int (__cdecl *)(FILE *)”的间接级别不同

3.)错误 3 错误 C2449:在文件范围内找到“{”(缺少函数头？)

4.)错误 4 错误 C1004:发现意外的文件结尾

5.)IntelliSense:“FILE *”类型的参数与参数不兼容

6.)IntelliSense:“int (__cdecl *)(FILE *_File)”类型的值不能分配给“FILE *”类型的实体

我还看到了“需要声明”的错误。每次我尝试解决问题时，最终都会在其他领域造成更多问题。有人可以帮我解决这个问题吗？谢谢!

这是我的代码:

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#define MAXGUESSES 5

int SingleGame(char file_letter);

int main()
{
    //declare additional variables
int PlayGames = 4,
i = 0;
FILE * infile;
char letter;
    //display instructions
    printf("Welcome to the Letter Guessing Game!\n");
    printf("You will enter the number of games that you want to play, which is 1-4 games\n");
    printf("You have 5 chances to guess each letter\n");
    printf("Let's begin!\n");

    //open file
    infile = fopen("lettersin.txt", "r");

    //get number of games to play
    printf("How many games would you like to play?(1-4)\n");
    scanf("%d", &PlayGames);

    for(i=0;i<PlayGames;i++)
    {
        //get a letter from file
        scanf(infile, " %c", &letter);

        //Play one game
        printf("Let's play a game %d\n", i);

        //check for win or lose
        SingleGame (letter);
    }

    //close file
    infile = fclose;
    return 0;
}
int SingleGame(char file_letter);
{

//Function definitions
    int numGuesses = 0;
    while(numGuesses < MAXGUESSES);
    char RetrieveGuess = 0;
    int PlayGames = 0;

    {
        printf("Enter a guess\n");
        scanf("%c" , &RetrieveGuess);
        if(file_letter == RetrieveGuess);
        {
            printf("You guessed it!\n");
        }
        else
        {
            if(file_letter>RetrieveGuess)
            {
                printf("The letter you are trying to guess comes before:%d\n",RetrieveGuess)
            }
            {
            else if(file_letter<RetrieveGuess)
            {
                printf("The letter you are trying to guess comes after:%d\n", RetrieveGuess)
            }


            {
            numGuesses = numGuesses +1;
            }

Answer 1

1.)Warning 1 warning C4133: 'function' : incompatible types - from 'FILE *' to 'const char *'

scanf(infile, " %c", &letter);

如果您想从特定的FILE *读取，请使用fscanf():

fscanf(infile, " %c", &letter);

2.)Warning 2 warning C4047: '=' : 'FILE *' differs in levels of indirection from 'int (__cdecl *)(FILE *)'

infile = fclose;

您想要调用fclose()，而不是将其分配给infile(它也没有兼容的类型):

fclose(infile);

3.)Error 3 error C2449: found '{' at file scope (missing function header?)

int SingleGame(char file_letter);

分号使其成为函数声明/原型(prototype)，但您想要定义一个。删除它。

这里的分号是所谓的空语句)。这意味着如果两个变量相等，则不会执行任何操作。

if(file_letter == RetrieveGuess);