链接的cpp文件 - 不能在其他文件中使用getline

我知道这可能看起来像一个简单的问题，但我有一个课堂作业，使20问题类型的游戏。我想我会多做一点菜单。该程序运行良好，但是当我输入实际的游戏文件时，它会输出第一行然后输出到我的最后一行并输出它......它不会让我键入和玩游戏。这很容易解决吗？链接的cpp文件 - 不能在其他文件中使用getline

当我开始我的程序时，菜单运行正常。它提示用户输入导航（1 =玩游戏，2 =指令，3 =字数据库，4 =退出）。当我按1支付游戏时，它会像屏幕一样清除屏幕，但不是让我回答第一个问题（动物，食物，元素等），它说：“它是动物，食物，元素，或其他？（输入a，f，e或o进行选择）“，就像它应该那样，但是接着我输入1并将其用作此问题的输入，使其输出”这不是一个选项！“在提示输入关闭程序之前。我怎样才能解决这个问题？我并不热衷于包括我所有的代码，因为它是几百线长，但这里是我的菜单文件，头文件，和我的游戏文件的开头：

myheader.h：

#include <windows.h> 
#include <iostream> 

void runGame(); 
void showHowTo(); 
void showWords(); 
void mainMenu();

menu.cpp：

#include <iostream> 
#include <string> 
#include "myheader.h" 
#include <windows.h> 

using namespace std; 

int main() 
{ 

    int x = 0; 
    cout << "*******************************\n"; 
    cout << "*****20 QUESTIONS**************\n"; 
    cout << "*******************************\n\n"; 

    cout << "Press a key to make a selection.\n\n\n"; 

    cout << "1: Play Game" << endl; 
    cout << "2: View Instructions" << endl; 
    cout << "3: View Word Database" << endl; 
    cout << "4: Close Window\n\n\n"; 

    cin >> x; 

    if (x == 1) 
    { 
     system("cls"); 
     runGame(); 
    } 
    else if (x == 2) 
    { 
     //instructions function would be here, but was removed as it is not relevant to my question 
    } 
    else if (x == 3) 
    { 
     //word database function would be here, but was removed as it is not relevant to my question 
    } 
    else if (x == 4) 
    { 
     system("pause"); 
     return 0; 
    } 



    system("pause"); 
    return 0; 
}

game.cpp：

#include <iostream> 
#include <string> 
#include "myheader.h" 
#include <windows.h> 

using namespace std; 

void runGame() 
{ 
    //declaring variables 

    string userInput = ""; 
    bool no = ((userInput == "no") || (userInput == "No") || (userInput == "NO") || (userInput == "nO")); 
    string disappointment = "Awww... Oh well, maybe I'll get it next time!\n"; 
    string excitement = "Yay! I feel smart!\n"; 
    bool animal = ((userInput == "A") || (userInput == "a")); 
    bool food = (userInput == "F" || userInput == "f"); 
    bool element = (userInput == "E" || userInput == "e"); 
    bool other = (userInput == "O" || userInput == "o"); 

    // Prompt user for input (animal, vitamin, element, or other 

    cout << "Welcome to 20 Questions!\nPlease think of something, and answer the questions honestly!\n\n"; 
    cout << "Is your object an animal, vitamin, element, or other? (Please answer A, F, E, or O)\n"; 
    getline(cin,userInput); 
    animal = ((userInput == "A") || (userInput == "a")); 
    food = (userInput == "F" || userInput == "f"); 
    element = (userInput == "E" || userInput == "e"); 
    other = (userInput == "O" || userInput == "o"); 

    if (animal) 
    { 
     //full game in here 
    } 
    else 
    { 
     cout << "That's not an option!\n"; 
    } 

    system("pause"); 
}

这些都是代码文件，我挣扎......请不要指出系统（“暂停”）效率不高，我已经知道了。我只需要知道如何在游戏开始运行时让我的用户输入工作。如果我的描述很糟糕，这些是我输出的照片。

菜单：