Question

我必须创建一个创建猜字母游戏的程序。一切都成功建立。但是，我遇到了一个问题，因为GetTheLetter函数和CompareThe Letters函数同时组合和打印。当它提示用户猜测时，它还会打印出CompareTheLetters函数的第一个if语句。我做错了什么？

#define _CRT_SECURE_NO_WARNINGS
#define MAXGUESSES 4
#include <stdio.h>

void GuessItRules(); //Game instructions
int PlayOneGame(char letter); //Runs a game
char GetTheLetter(); //Prompts user to guess and returns guess
int IsAWinner(char letter, char userguess); //Returns either a 1 or a 0 depending on if the user guessed correctly
void CompareTheLetters(char letter, char userguess); //Prints message dependent on whether guess comes before, after, or is the letter


int main()
{
    //declare additional variables
    //declare FILE pointer
    FILE* PTR;

    int numOfgames; //number of games user wants to play
    int i;      //iterator

    char letter;    //letter from file
    int win;    //variable for the return of the PlayOneGame function

    //display instructions
    GuessItRules();
    //connect to the file HINT: use fopen
    PTR = fopen("letters.txt", "r");
    //get number of games to play
    printf("Let's start playing!\n\nHow many games would you like to play (1-5)?\n\n");
    scanf("%d", &numOfgames);
    //this for loop will allow the player to play more than one game
    //without recompiling
    for (i = 0; i < numOfgames; i++)
    {
        //get a letter from file - use fscanf
        fscanf(PTR, "%c", &letter);

        //Play one game (Call PlayOneGame function) - remember the function has an int return type
        win = PlayOneGame(letter);
        //tell the player if they have won or lost (test the variable win)      
        if (win == 1)
            printf("Congrats! You guessed the correct letter!!\n\n");
        else if (win == 0)
            printf("I'm sorry you did not guess the correct answer :( The letter was %c\n\n", letter);
    }

    //close file 
    fclose(PTR);
    return 0;
}

//Function definitions

void GuessItRules()
{
    printf("Welcome to the Guess the Letter Game!\n-------------------------------------\n\n");
    printf("You will have 4 chances to guess the letter per a game\n\n");
}

int PlayOneGame(char letter)
{
    int numOfguesses = 0;
    int winOrLose = 0;  //should be intialized
    char userguess;     // user guess

    //As long as the user  has not used up the maximum number
    //of guesses and has not guessed correctly 
    //the game will continue using this while loop
    while (numOfguesses < MAXGUESSES && winOrLose == 0)
    {

        //function call to GetTheletter - returns to userguess variable
        userguess = GetTheLetter();
        //function call to IsAWinner - returns to winOrLose variable (0 or 1)
        winOrLose = IsAWinner(letter, userguess);
        //function call to CompareTheLetters - gives the user a message
        CompareTheLetters(letter, userguess);
        //update counter for number of guesses used
        numOfguesses = numOfguesses + 1;
    }

    return winOrLose;  //(0 or 1)
}

char GetTheLetter()
{
    char userguess;
    printf("Please enter a guess \n\n");
    scanf("%c", &userguess);
    return (userguess);
}

int IsAWinner(char letter, char userguess)
{
    if (userguess == letter)
        return (1);
    else
        return (0);
}

void CompareTheLetters(char letter, char userguess)
{
    if (userguess < letter)
    {
        printf("The letter you are trying to guess comes after %c\n\n", userguess);
    }
    else if (userguess > letter)
    {
        printf("The letter you are trying to guess comes before %c\n\n", userguess);
    }
    else if (userguess == letter)
    {
        printf("The letter is %c!!!!\n\n", userguess);
        printf("Congrats!!! You did it!!\n\n");
    }

}

Answer 1

问题出在于你要求用户写一封信来猜测。

当您使用%c格式说明符scanf时，换行符满足此格式说明符。由于您之前输入的输入缓冲区中会留下换行符，因此会选择该换行符。

在格式字符串的开头添加一个空格以吸收换行符：

scanf(" %c", &userguess);

请注意，其他格式说明符（例如%d和%f）会跳过换行符，与%c不同。因此，%c 仅需要跳过换行符的主要空间。

两个功能同时发生

1 个答案: