Question

#include "stdafx.h"
#include <string>;
#include <iostream>;
#define newline '\n';
using namespace std;




string initial;
string a;
string b;
string c;
string object;
string sword;
string testswing;

int main()
{

    cout << "you awake in a forest with no memory what do you do?";
    cout << newline;
    cin >> initial;
    if (initial == "look left" || initial == "look forward" || initial == "look behind"){
        cout << newline;
        cout << "you see a dense forest";
        cout << newline;

    }

    else (initial == "look right"); {
        cout << newline;
        cout << "you see a opening with a shape in the distance";
        cout << newline;
    }

    cin >> a;
    cout << newline;
    if (a == "go right")
    {
        cout << newline;
        cout << "you see a trap lucily you dident set it off. might want to SEARCH AREA before going into open areas";
        cout << newline;
        cin >> c;
        cout << newline;
        if (c == "go forward")
        {
            cout << newline;
            cout << "you arrive at the strange object do you want to INSPECT OBJECT?";
            cout << newline;
            if (object == "inspect object")
            {
                cout << newline;
                cout << "You see the object is a sword stuck in a stone";
                cout << newline;
                cin >> sword;
                if (sword == "pull sword");
                {
                    cout << newline;
                    cout << "the sword breaks free of the stone you have obtained the SHORT SWORD";
                        cout << newline;
                    cout << "use this item when appropriate by using the command SWING SWORD";
                    if (testswing == "swing sword");
                    {
                        cout << newline;
                        cout << "you swing the sword it hits the rock and breaks";
                        cout << newline;
                        cout << "we told you only to use the sword when appropriate now look what you've done your adventure is over already";
                            cout << newline;
                            system("pause");
                            return 0;
                    }
                }
            }
            else
            {
                cout << newline;
                cout << "the object draws you twards it seemingly by magic";
                cout << newline;
            }
        }
        else (c == "go left" || c == "go right"|| c == "go back");
        {
            cout << "there is nothing but empty feilds for miles you get lost and die";
            cout << newline;
            system("pause");
                return 0;
        }
    }
    else {
        cout << "you cant go that way";
    }

}

程序在第一个用户输入之后退出，无论输入是什么，如果它的外观向左看，向前看，向后看，或者看起来正确，程序在它之后退出并且我无法找到问题。它说程序退出时带有代码0（0X0）

Answer 1

代码的cin>>initial部分只接受用户输入，直到第一个空格

因此，当您输入LOOK LEFT时，初始字符串只包含LOOK，这就是您的代码未输入IF语句的原因。

尝试使用getline（初始）而不是cin＆gt;＆gt;

查看此link

Answer 2

我发现这个程序存在一些问题。

如果你想要多个单词输入 - 使用getline（cin，str） - cin只会把第一个单词作为输入。
一旦发出EOF（或任何其他错误）信号，所有输入数据的尝试都将失败。在尝试进一步输入之前，必须首先清除流（cin.clear（）;）。因此，对于每个cin，使用cin.clear（）来刷新输入缓冲区。

现在在程序中，如果你没有使用clear（），并输入多个单词输入，则第一个单词将被输入到第一个字符串，该输入的第二个单词将被输入第二个“cin＆gt;＆gt; a”，因此它不会停止，因为它得到了输入。

试试这个： -

//#include "stdafx.h"
#include <string>;
#include <iostream>;
#define newline '\n';
using namespace std;

string initial;
string a;
string b;
string c;
string object;
string sword;
string testswing;

int main()
{

    cout << "you awake in a forest with no memory what do you do?";
    cout << newline;
    getline(cin, initial);
    if (initial == "look left" || initial == "look forward" || initial == "look behind"){
        cout << newline;
        cout << "you see a dense forest";
        cout << newline;

    }

    else if(initial == "look right") {
        cout << newline;
        cout << "you see a opening with a shape in the distance";
        cout << newline;
    }
    cin.clear();
    getline(cin, a);
    cout << newline;
    if (a == "go right")
    {
        cout << newline;
        cout << "you see a trap lucily you dident set it off. might want to SEARCH AREA before going into open areas";
        cout << newline;
        cin >> c;
        cout << newline;
        if (c == "go forward")
        {
            cout << newline;
            cout << "you arrive at the strange object do you want to INSPECT OBJECT?";
            cout << newline;
            if (object == "inspect object")
            {
                cout << newline;
                cout << "You see the object is a sword stuck in a stone";
                cout << newline;
                cin >> sword;
                if (sword == "pull sword");
                {
                    cout << newline;
                    cout << "the sword breaks free of the stone you have obtained the SHORT SWORD";
                        cout << newline;
                    cout << "use this item when appropriate by using the command SWING SWORD";
                    if (testswing == "swing sword");
                    {
                        cout << newline;
                        cout << "you swing the sword it hits the rock and breaks";
                        cout << newline;
                        cout << "we told you only to use the sword when appropriate now look what you've done your adventure is over already";
                            cout << newline;
                            system("pause");
                            return 0;
                    }
                }
            }
            else
            {
                cout << newline;
                cout << "the object draws you twards it seemingly by magic";
                cout << newline;
            }
        }
        else (c == "go left" || c == "go right"|| c == "go back");
        {
            cout << "there is nothing but empty feilds for miles you get lost and die";
            cout << newline;
            system("pause");
                return 0;
        }
    }
    else {
        cout << "you cant go that way";
    }
    cout<<endl;
    system("PAUSE");
}

我无法找到程序在第一次用户输入后立即退出的原因

2 个答案: