Question

我刚刚开始学习C ++，正在为一个基于文本的冒险游戏制作一个小游戏模板的东西，并希望得到一些帮助。其中一个是排除答案，另一个是在一个人回答并输出后弹出新问题。我会咨询我正在观看的教程的创建者，但他从未超过第2部分，并且在3年内没有触及他的youtube频道。我尝试使用=!代替==来获取答案并替换输入内容。我一直在使用在线编译器（http://cpp.sh）来加快编辑速度，所以这里是崩溃日志：

23:25: error: no match for 'operator||' (operand types are 'bool' and 'std::string {aka std::basic_string<char>}') 23:25: note: candidate is: 23:25: note: operator||(bool, bool) <built-in> 23:25: note: no known conversion for argument 2 from 'std::string {aka std::basic_string<char>}' to 'bool' 23:43: error: no match for 'operator||' (operand types are 'bool' and 'std::string {aka std::basic_string<char>}') 23:43: note: candidate is: 23:43: note: operator||(bool, bool) <built-in> 23:43: note: no known conversion for argument 2 from 'std::string {aka std::basic_string<char>}' to 'bool' 23:60: error: no match for 'operator||' (operand types are 'bool' and 'std::string {aka std::basic_string<char>}') 23:60: note: candidate is: 23:60: note: operator||(bool, bool) <built-in> 23:60: note: no known conversion for argument 2 from 'std::string {aka std::basic_string<char>}' to 'bool'

这是我的代码：

#include <iostream>
using namespace std;

int main(int argc, char *argv[]){
    string input;
    int hp = 100;
    int finalhp;
    cout << "Your HP: " << hp << endl;
    cout << "Walking in the DANK castle dungeon, you stumble upon a dying man. Would you like to finish him off?\n1. Yes\n2. No" << endl;
    cin >> input;
    if (input == "yes" || input == "Yes") {

        finalhp = hp - 5;
        cout << "You monster, you should have helped him. You are attacked by guilt. -5 HP. You are now at:" << finalhp << endl;
    }
    else if (input == "no" || input == "No"){

        finalhp = hp + 5;
        cout << "You spared the man's life. While he sits there peacefully recovering, he gives you a potion giving you 5 hp. You are now at: " << finalhp << endl;

    }

else if (input =! "yes" || input =! "Yes" || input =! "no" || input =! "No"){

        cout << "Quit babbling like an idiot and answer my question!";

        return 0;
    }

}

任何帮助都会很棒！

Answer 1

无数错别字。

input =! "yes" || input =! "Yes" || input =! "no" || input =! "No"
      ^^                ^^                ^^               ^^

应该是

input != "yes" || input != "Yes" || input != "no" || input != "No"

如果你看operator precedence，表达式

input =! "yes" || input =! "Yes" || input =! "no" || input =! "No"

会非常疯狂，而不是你想到的简单表达。

Answer 2

=!不是C ++中的运算符。不等于运算符是!=。因此，您的最后else if条件没有按照您的想法进行。它基本上是在做

input = (!"yes" || input = (!"Yes" || input = (!"no" || input = !"No")))

导致您的错误，即operator||(bool, std::string)已存在。

C ++错误：=！不编译文本冒险游戏

2 个答案: