I can't understand what is the difference of void type data type to the other data types, can anyone explain what is the use of void data type to a program

Answer 1

Void is not a data type. It basically means "empty". It is used to indicate a function won't take any parameter or return anything.

void MyFunc(int a) is a function returning nothing.

int MyFunc2(void) is a function accepting no parameter.

int MyFunc3() is a function accepting as many parameters as you want. Most people writing this actually mean that it doesn't take any parameter and should have written it with void, like in MyFunc2.