c++ - 声明时还有另一个 'not declared in this scope' 问题

Question

我目前正在为一个类开发一个卡片程序，我遇到了一个问题，编译器告诉我，当它们在范围内声明时，它们并没有在范围内声明，而有些东西在它声明时根本没有声明是。这是代码:

卡片.h:

#ifndef _CARD_H
#define _CARD_H

#include <iostream>
#include <string>

using namespace std;

enum RANK{Joker, Ace = 1, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King}
enum SUIT{Clubs, Diamonds, Hearts, Spades}

class Card
{
private:
    //Rank and Suit variables for all cards
    int rank;
    int suit;

public:
    //Constructors
    Card();
    Card(int r, int s);

    //Getters
    int getRank();
    int getSuit();

    //Setters
    void setRank(int r);
    void setSuit(int s);

    //toString
    string toString();
};

#endif

卡片.cpp:

#ifndef _CARD_H
#define _CARD_H
#include "Card.h"
#include <iostream>
#include <string>

using namespace std;

//Default constructor
Card::Card()
{
    rank=Joker;
    suit=Clubs;
}

//Constructor
Card::Card(int r, int s)
{
    rank = r;
    suit = s;
}

//Getters for rank and suit
int Card::getRank()
{
    return rank;
}
int Card::getSuit()
{
    return suit;
}

//Setters for rank and suit
void Card::setRank(int r)
{
    rank = r;
}
void Card::setSuit(int s)
{
    suit = s;
}

//toString function for output
string Card::toString()
{
    string tempstring = ""; //list of if-else statements for what to add to the string that gets printed
    if (rank == 0)
    {
        tempstring += "Joker";
        goto stringEnd; //sends the process to the end of the list if rank is Joker so it doesn't attempt to add a suit to the card toString
    }
    else if (rank == 1)
        tempstring += "Ace of ";
    else if (rank == 2)
        tempstring += "Two of ";
    else if (rank == 3)
        tempstring += "Three of ";
    else if (rank == 4)
        tempstring += "Four of ";
    else if (rank == 5)
        tempstring += "Five of ";
    else if (rank == 6)
        tempstring += "Six of ";
    else if (rank == 7)
        tempstring += "Seven of ";
    else if (rank == 8)
        tempstring += "Eight of ";
    else if (rank == 9)
        tempstring += "Nine of ";
    else if (rank == 10)
        tempstring += "Ten of ";
    else if (rank == 11)
        tempstring += "Jack of ";
    else if (rank == 12)
        tempstring += "Queen of ";
    else if (rank == 13)
         tempstring += "King of ";
    if (suit == 0)
        tempstring += "Clubs";
    else if (suit == 1)
        tempstring += "Diamonds";
    else if (suit == 2)
        tempstring += "Hearts";
    else if (suit == 3)
        tempstring += "Spades";
    stringEnd:
    return tempstring;
}

#endif

我不确定为什么编译不正确。我觉得一切都很好。

Answer 1

你不应该在 .cpp 文件中使用 #include 守卫。您的 .h 文件基本上根本没有被解析，因为 _CARD_H 已经定义。