void in C means that a function or method has no return value or parameters. Specifically: a function return type of void means it does not return any value. The function parameter type is void, which means there are no parameters. void* represents a pointer to an object of any type. A template function or method can use void as a parameter or return value type, making it compatible with any type. void can be used to define macros, which are expanded during the preprocessing phase.
The role of void in C
In C, void is a special type modifier. Represents a function or method that has no return value or parameters.
void in functions and methods
When used as the return type of a function or method, void means that the function returns no value. For example:
<code class="cpp">void printHello() { cout << "Hello, world!" << endl; }</code>
void in parameters
When used as a parameter type, void indicates that the function or method has no parameters. For example:
<code class="cpp">void printMessage(void) { cout << "This function has no parameters." << endl; }</code>
Special uses
In addition to these basic usages, void is also used in some special situations:
Advantages
The benefits of using void include:
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