Question

Is void a data type in the C programming language? If so, what type of values can it store? If we have int, float, char, etc., to store values, why is void needed? And what is the range of void?

Answer 1

Void is considered a data type (for organizational purposes), but it is basically a keyword to use as a placeholder where you would put a data type, to represent “no data”.

Hence, you can declare a routine which does not return a value as:

void MyRoutine();

But, you cannot declare a variable like this:

void bad_variable;

However, when used as a pointer, then it has a different meaning:

void* vague_pointer;

This declares a pointer, but without specifying which data type it is pointing to.