What does $ mean in c++

In C, the $ symbol is used to: Stringize macros: Convert macro parameters into string form, the format is #define STR(x) #xSTR(Hello), the result is "Hello" string constant. Exception handling: The current exception object is represented in the catch block, in the format of catch (std::exception& e), and e.$what() is used to return exception description information.

The $ symbol in C

In C, the $ symbol is mainly used in the following two situations:

characters The stringification macro

$ symbol is used in stringification macros to convert macro parameters into string form. Macro parameters are enclosed in parentheses and placed after the $ symbol. For example:

<code class="cpp">#define STR(x) #x
STR(Hello) // 转换为 "Hello" 字符串常量</code>

Exception handling

$ symbols are used to catch and handle exceptions. In a catch block, the $ symbol represents the exception object currently being handled. For example:

<code class="cpp">try {
  // ...
} catch (std::exception& e) {
  std::cout << "An exception occurred: " << e.$what() << std::endl;
}</code>

$what() The method returns the exception object describing the error message.

The above is the detailed content of What does $ mean in c++. For more information, please follow other related articles on the PHP Chinese website!