Question

我的功能如下：

string toOriginal(char c)
{
    if (c == '$')
        return "car";
    else if (c == '#')
        return "cdr";
    else if (c == '@')
        return "cons";
    else
    {
        string t = to_string(c);
        return t;
    }
}

然而，当我的角色c包含类似＆＃39; r＆＃39;的值时，我希望它能够返回＆＃34; r＆＃34;作为一个字符串。但是，它返回一个字符串＆＃34; 114＆＃34;。

Answer 1

std::to_string does not have an overload that takes a char. It converts the char to an int and gives you the string representation of the int.

Use std::string's constructor.

string t(1, c);

Answer 2

你也可以使用这样的替代字符串构造函数：

  ...
    else
    {
        return std::string(&c, 1);
    }

Answer 3

The method to_string() is for converting a numerical value to a string. A char is a numerical type.

See this related question on how to do it right: Preferred conversion from char (not char*) to std::string

将char变量转换为字符串变量的C ++返回ASCII值

3 个答案: