c++ 编译错误:ISO C++ 禁止指针和整数之间的比较 [英] c++ compile error: ISO C++ forbids comparison between pointer and integer

问题描述

我正在尝试 Bjarne Stroustrup 的 C++ 书籍第三版中的一个示例.在实现一个相当简单的函数时，我得到以下编译时错误:

I am trying an example from Bjarne Stroustrup's C++ book, third edition. While implementing a rather simple function, I get the following compile time error:

error: ISO C++ forbids comparison between pointer and integer

可能是什么原因造成的?这是代码.错误在 if 行:

What could be causing this? Here is the code. The error is in the if line:

#include <iostream>
#include <string>
using namespace std;
bool accept()
{
    cout << "Do you want to proceed (y or n)?
";
    char answer;
    cin >> answer;
    if (answer == "y") return true;
    return false;
}

谢谢！

推荐答案

您有两种方法可以解决此问题.首选方法是使用:

You have two ways to fix this. The preferred way is to use:

string answer;

(而不是 char).另一种可能的修复方法是:

(instead of char). The other possible way to fix it is:

if (answer == 'y') ...

(注意单引号而不是双引号，代表一个 char 常量).

(note single quotes instead of double, representing a char constant).

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