关于c ++ 11：cout不是std的成员，还有关于c ++的其他问题

cout is not a member of std, and other issues regarding c++

请允许我在前言中说我确实已经包含(也适用于字符串，endl，而且字面上一切都不起作用);就语法而言，我的IDE没有显示任何错误;我无法理解为什么会出现这个问题？它在我写的其他一些C ++代码示例中工作正常。

所以我想做一个小游戏，公牛和奶牛。我的主要代码如下：

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#include <iostream>

#include"stdafx.h"
#include"BullsAndCows.h"

using std::cout;
using std::endl;
using std::cin;
using std::string;

int main()
{

string userInput ="";
bool playAgain = false;

int gameDiff;

constexpr char * GREETING ="Welcome to Bulls and Cows! Please enter the difficulty level: (1) Easy, (2) Medium, (3) Hard";

cin >> gameDiff;

do
{
BullsAndCows *bc = new BullsAndCows();
bc->playGame(gameDiff);

} while (playAgain);

constexpr char * INFORMATION ="Total Word Length is:";

//Introduce the game.

cout << GREETING <<endl;

return 0;
}

我的标题：

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#ifndef BULLSANDCOWS_H
#define BULLSANDCOWS_H

class BullsAndCows {

public:

void playGame(int gameDiff);

};

#endif

最后，我的BullsAndCows.cpp文件：

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#include <iostream>
#include <string>
#include"stdafx.h"
#include"BullsAndCows.h"

using std::cout;
using std::endl;
using std::cin;
using std::string;

void BullsAndCows::playGame(int gameDiff) {

string wordGuess ="";
string secretWord ="";
int numBulls = 0;
int numCows = 0;
int numGuesses = 0;

switch (gameDiff)
{

case 1: {
numGuesses = 30;

secretWord ="Hello";

for (int i = 0; i < 30; i++) {

numBulls = 0;
numCows = 0;

cout <<"Word Length to Guess Is Five, you have" << numGuesses <<" guesses remaining" << endl;
cout <<"Enter your word guess";
cin >> wordGuess;

for (int j = 0; j < wordGuess.length; j++) {
if (wordGuess.at(j) == secretWord.at(j)) {
numBulls++;
}
else if (secretWord.find(wordGuess.at(j)) != -1) {
numCows++;
}
}

cout <<"Bulls:" << numBulls << endl;
cout <<"Cows:" << numCows << endl;

if (numBulls == secretWord.length) {
cout <<"YOU WIN!" << endl;
break;
}

}

break;
}
case 2:
numGuesses = 20;
break;
case 3:
numGuesses = 10;
break;
}

}

我得到的错误是"cout不是std的成员"，cout符号不能在using声明中使用。在此之前我使用"使用命名空间std"并且会返回错误，例如"BullsAndCows"不是命名空间或类(如果它不是类，那么我必须是火星人)。还有一些关于失踪的";"在userInput之前，例如在我的main.cpp代码中;没有任何意义，因为没有任何东西可以忽略。我正在使用VS2017。为什么C ++会成为一种讨厌的语言？