为什么我不能在程序中声明字符串:"string is undeclared identifier"? [英] Why can't I declare a string in my program: "string is undeclared identifier"

问题描述

我无法在程序中声明字符串:

I can't declare a string in my program:

string MessageBoxText = CharNameTextBox->Text;

那是行不通的.它说 string是未声明的标识符.我在命名空间中缺少什么或包含或类似的东西?

it just doesn't work. It says string is undeclared identifier. What am I missing in the namespace or include or something like that?

推荐答案

确保已包含此标头:

#include <string>

然后使用 std :: string 而不是 string .这是因为 string 是在 std 命名空间中定义的.

And then use std::string instead of string. It is because string is defined in std namespace.

也不要在命名空间范围内编写此代码:

And don't write this at namespace scope:

using namespace std; //bad practice if you write this at namespace scope

但是，在函数范围内编写它并不坏.但是最好的是我之前建议的:

However, writing it at function scope is not that bad. But the best is one which I suggested before:

将 std :: string 用作:

Use std::string as:

std::string MessageBoxText = CharNameTextBox->Text;

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