What does void mean in C++ and what is its function

In C, void can represent an empty type or specify a function without parameters: Empty type: void represents an empty type that does not contain any members, and is often used for function return types (indicating no return value) and pointer to null types. Parameterless function: void can be used to declare or define a function that does not receive any parameters, for example: void printMessage() { std::cout << "Hello World!" << std::endl; }.

The meaning and function of void in C

void keyword

In the C programming language, void is a keyword with two main meanings:

1. Refers to the empty type

void can represent an empty type, that is, a type that does not contain any members. It is usually used in the following situations:

• is used as the return type of a function, indicating that the function does not return any value.
• As a pointer type to a null type.

2. Specify a function without parameters

When declaring or defining a function that does not accept any parameters, you can use the void key Word to specify without parameters. For example:

<code class="cpp">void printMessage() {
  std::cout << "Hello World!" << std::endl;
}</code>

Function

void The keyword has the following functions in C:

• Allows definitions that are not Functions that return any value, thereby improving code readability and maintainability.
• Avoid returning invalid values ​​unnecessarily.
• Allows the declaration of functions without parameters to simplify the code structure.
• can be used to create a pointer to a null type, which is useful in certain scenarios.

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