c++ - 程序在 CIN 输入处崩溃 | C++

Question

所以我制作了一个 DOS 程序，但是我的游戏总是在我第二次运行 cin 函数时崩溃。

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>

using namespace std;

//call functions
int create_enemyHP (int a);
int create_enemyAtk (int a);
int find_Enemy(int a);
int create_enemyDef (int a);

// user information
int userHP = 100;
int userAtk = 10;
int userDef = 5;
string userName;

//enemy Information
int enemyHP;
int enemyAtk;
int enemyDef;
string enemies[] = {"Raider", "Bandit", "Mugger"};
int sizeOfEnemies = sizeof(enemies) / sizeof(int);
string currentEnemy;
int chooseEnemy;

// ACTIONS 
int journey;

int test;

int main()
{
    // main menu 
    cout << "welcome brave knight, what is your name? " ;
    cin >> userName;
    cout << "welcome " << userName << " to Darland" << endl;

    //TRAVELING 

MENU:

    cout << "where would you like to travel? " << endl;
    cout << endl << " 1.> Theives Pass " << endl;
    cout << " 2.> Humble Town " << endl;
    cout << " 3.> Mission HQ " << endl;
    cin >> journey;

    if (journey == 1) 
    {

        // action variable;
        string c_action;

        cout << "beware your journey grows dangerous " << endl;

        //begins battle

        // Creating the enemy, HP ATK DEF AND TYPE. ;

        srand(time(0));

        enemyHP = create_enemyHP(userHP);

        enemyAtk = create_enemyAtk(userAtk);

        enemyDef = create_enemyDef(userDef);

        chooseEnemy = find_Enemy(sizeOfEnemies);

        currentEnemy = enemies[chooseEnemy];

        cout << " Here comes a " << currentEnemy << endl;
        cout << "stats: " << endl;
        cout << "HP :" << enemyHP << endl;
        cout << "Attack : " << enemyAtk << endl;
        cout << "Defense : " << enemyDef << endl;
ACTIONS:            
        cout << "Attack <A> | Defend <D> | Items <I>";
        cin >> c_action;

        //if ATTACK/DEFEND/ITEMS choice

        if (c_action == "A" || c_action == "a"){

            enemyHP = enemyHP - userAtk;
            cout << " you attack the enemy reducing his health to " << enemyHP << endl;
            userHP = userHP - enemyAtk;
            cout << "however he lashes back causing you to have " << userHP << "health left " << endl;
            //end of ATTACK ACTION
        }

最后一行“cin >> c_action 崩溃了。我使用了另外两个页面。它们只是创建函数。这是一个编译器问题。还有为什么我的编译器在运行他的应用程序后总是关闭。有没有办法停止是吗？

Answer 1

一些提示: 如果可以避免，我从不使用函数的前向声明(例如“int create_enemyHP (int a);”)。如果你这样做，那么你的代码中有两个地方必须是正确的，你的程序才能工作。如果总是有一个“single source of truth”，它会让生活更轻松

您是否通过调试器运行此代码？它将帮助您更快地发现问题。