Question

当我尝试在FBullCowGame.h中更改我的2个私有类变量时，我遇到了问题。似乎构造函数正在调用函数Reset（）[位于FBullCowGame.cpp]但是Reset（）函数不会改变整数MyMaxTries＆amp; MyCurrentTry。我是c ++的新手，所以可能它显而易见但我无法找到它。

这是main.cpp

#include <iostream>
#include <string>
#include "FBullCowGame.h"

using FText = std::string;

void PrintIntro();
void PlayGame();

FText GetGuess();
FText PrintGuess();

FBullCowGame BCGame;//Dodeljujemo naziv u main-u FBullCowGame-u , takodje ako ima neki kod u constructoru on ga izvrsava pri ovaj deklaraciji


bool AskToPlayAgain();


int main() 
{

    bool bPlayAgain = false;
    do {
        PrintIntro();
        PlayGame();
        bPlayAgain = AskToPlayAgain();
        }
    while (bPlayAgain);

        return 0;
}

void PrintIntro()
{
    //Define constant var
    constexpr int WORD_LENGHT = 6;

    //Welcome to the player and asking the guess
    std::cout << "Welcome to Bulls and Cows\n";
    std::cout << "Can you guess my " << WORD_LENGHT;
    std::cout << " letter isogram word?\n";
}

void PlayGame()
{
    BCGame.Reset();
    int MaxTries = BCGame.GetMaxTries();
    //Looping for guesses
    for (int i = 1; i <= MaxTries; i++)
    {
        FText Guess = GetGuess();
        //Repeat the guess back to them
        std::cout << "Your guess is: " << Guess << std::endl;
        std::cout << std::endl;
    }
    return;
}

FText GetGuess()
{
    int CurrentTry = BCGame.GetCurrentTry();

    //Player enters their guess
    std::cout << std::endl << "Try " << CurrentTry << ".What is your guess?\n";
    FText Guess = "";
    std::getline(std::cin, Guess);

    return Guess;
}

bool AskToPlayAgain()
{
    FText Response = "";
    std::cout << "Do you want to play again (y/n) ?" << std::endl;
    std::getline(std::cin, Response);

    return (Response[0] == 'y') || (Response[0] == 'Y');


}

FBullCowGame.h /

#pragma once
#include <string>

class FBullCowGame {
public:
    FBullCowGame();//Constructor izvrsava se kod u njemu pri deklaraciji BCGame u nasem slucaju


    int GetMaxTries() const;
    int GetCurrentTry()const;
    bool IsGameWon()const;

    void Reset();
    bool CheckGuessValidity(std::string);



private:
    //Compile time values gets overwritten by run time values in Constructor
    int MyMaxTries;
    int MyCurrentTry;



};

和FBullCowGame.cpp /

#include "FBullCowGame.h"

FBullCowGame::FBullCowGame()
{
    //Run time values
    Reset();
}

void FBullCowGame::Reset()
{

    constexpr int MAX_TRIES = 8;
    int MyMaxTries = MAX_TRIES;
    int MyCurrentTry = 1;

    return;
}

int FBullCowGame::GetMaxTries ()const
{
    return MyMaxTries;
}

int FBullCowGame::GetCurrentTry ()const
{

    return MyCurrentTry;
}

bool FBullCowGame::IsGameWon ()const
{
    return false;
}

bool FBullCowGame::CheckGuessValidity(std::string)
{
    return false;
}

Answer 1

您正在使用恰好具有完全相同名称的函数局部变量来遮蔽您的成员变量。

void FBullCowGame::Reset()
{

    constexpr int MAX_TRIES = 8;
    int MyMaxTries = MAX_TRIES;
    int MyCurrentTry = 1;

    return;
}

只需分配给您的会员变量，但不要重新声明

void FBullCowGame::Reset()
{    
    constexpr int MAX_TRIES = 8;
    MyMaxTries = MAX_TRIES;
    MyCurrentTry = 1;
}

私有类变量在调用函数时不会发生变化

1 个答案: