C++ 为什么我的循环中断了

我正在按照制作MUD（基于文本的RPG）的教程进行操作，但我的主要功能遇到了问题。 如果你看一下代码，你会发现当玩家移动时，它会检查随机遭遇，如果怪物！= 0，它将进入战斗循环。 当我在命令提示符下执行此操作时，它将允许我攻击怪物，但它永远不会进入怪物>攻击（mainPlayer）函数。 它只是回到屏幕，显示我是否要移动，休息，查看统计信息或退出。 任何这方面的帮助将不胜感激！

#include "stdafx.h"
#include "Map.h"
#include "Player.h"
#include <cstdlib>
#include <ctime>
#include <iostream>
using namespace std;
int main()
{
    srand( time(0) );
    Map gameMap;
    Player mainPlayer;
    mainPlayer.createClass();
    // Begin adventure
    bool done = false;
    while( !done )
    {
        // Each loop cycle we output the player position and
        // a selection menu.
        gameMap.printPlayerPos();
        int selection = 1;
        cout << "1) Move 2) Rest 3) View Stats 4) Quit: ";
        cin >> selection;
        Monster* monster = 0;
        switch( selection )
        {
        case 1:
            // Move the player
            gameMap.movePlayer();
            // Check for a random encounter.  This function
            // returns a null pointer if no monsters are
            // encountered.
            monster = gameMap.checkRandomEncounter();
            // 'monster' not null, run combat simulation.
            if( monster != 0)
            {
                // Loop until 'break' statement.
                while( true )
                {
                    // Display hitpoints
                    mainPlayer.displayHitPoints();
                    monster->displayHitPoints();
                    cout << endl;
                    // Player's turn to attack first.
                    bool runAway = mainPlayer.attack(*monster);
                    if( runAway )
                    {
                        break;
                    }
                    if( monster->isDead() )
                    {
                        mainPlayer.victory(monster->getXPReward());
                        mainPlayer.levelUp();
                        break;
                    }
                    monster->attack(mainPlayer);
                    if( mainPlayer.isDead() )
                    {
                        mainPlayer.gameover();
                        done = true;
                        break;
                    }
                }
                // The pointer to a monster returned from
                // checkRandomEncounter was allocated with
                // 'new', so we must delete it to avoid
                // memeory leaks.
                delete monster;
                monster = 0;
            }
            break;
        case 2:
            mainPlayer.rest();
            break;
        case 3:
            mainPlayer.viewStats();
            break;
        case 4:
            done = true;
            break;
        } // End switch statement
    } // End While statement
} // End main function

这是播放器：：攻击功能：

bool Player::attack(Monster& monster)
{
    int selection = 1;
    std::cout << "1) Attack 2) Run: ";
    std::cin >> selection;
    std::cout << std::endl;
    switch( selection )
    {
    case 1:
        std::cout << "You attack the " << monster.getName()
                  << " with a " << mWeapon.mName << std::endl;
        if( Random(0, 20) < mAccuracy )
        {
            int damage = Random(mWeapon.mDamageRange);
            int totalDamage = damage - monster.getArmor();
            if( totalDamage <= 0)
            {
                std::cout << "Your attack failed to penetrate the " 
                          << monster.getName() << "'s armor." << std::endl;
            }
            else
            {
                std::cout << "You attack for " << totalDamage
                          << " damage!" << std::endl;
                // Subtract from monster's hitpoints.
                monster.takeDamage(totalDamage);
            }
        }
        else
        {
            std::cout << "You miss!" << std::endl;
        }
        std::cout << std::endl;
        break;
    case 2:
        // 25% chance of being able to run.
        int roll = Random(1, 4);
        if( roll == 1 )
        {
            std::cout << "You run away!" << std::endl;
            return true; //<-- Return out of the function.
        }
        else
        {
            std::cout << "You could not escape!" << std::endl;
            break;
        }
    }
}

这是怪物：：攻击功能：

void Monster::attack(Player& player)
{
    cout << "A " <<mName << " attacks you "
         << "with a " << mWeapon.mName << std::endl;
    if( Random(0,20) < mAccuracy )
    {
        int damage = Random(mWeapon.mDamageRange);
        int totalDamage = damage - player.getArmor();
        if( totalDamage <= 0 )
        {
            cout << "The " << mName << "'s attack failed to "
                 << "penetrate your armor." << endl;
        }
        else
        {
            cout << "You are hit for " << totalDamage
                 << " damage!" << endl;
            player.takeDamage(totalDamage);
        }
    }
    else
    {
        cout << "The " << mName << " missed!" << endl;
    }
    cout << endl;
}