Application of void data type in c plus plus programming language?

Answer 1

The voiddata type is used when a function doesn't return any value, and/or when it has no parameters at all. Pointer type 'void *' is a generic pointer.

A void pointer is used when it needs to be assigned to different data types later on in a program. Since it avoids type checking, void pointers should be used with care.

Answer 2

"void" is not a data type but a keyword that indicates the absence of data type.

// cannot create a variable of type "void" because "void" is not a type

// the following statement is incorrect:

void x;

// can use keyword "void" to say that a function takes no parameters

int function_without_parameters(void);

// can use keyword "void" to say that a function does not return a result

void function_without_result(int);

// can use keyword "void" to say that we do not know what kind of data type a pointer points to

void* pointer_to_unknown_datatype;