What does void mean in C, C++, and C#?

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Basically it means “nothing” or “no type”

There are 3 basic ways that void is used:

  1. Function argument: int myFunc(void)
    — the function takes nothing.

  2. Function return value: void myFunc(int)
    — the function returns nothing

  3. Generic data pointer: void* data
    — ‘data’ is a pointer to data of unknown type, and cannot be dereferenced

Note: the void in a function argument is optional in C++, so int myFunc() is exactly the same as int myFunc(void), and it is left out completely in C#. It is always required for a return value.

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