Can we do explicit conversion to primary type with user-defined data type??

Answer 1

Something like this?

#include <iostream>

class Integer
{
public: int v;
Integer(int x) { v = x; }
operator int(){ return v; }
};

int main()
{
int primitive_type;
Integer user_defined_type(3939);
primitive_type = user_defined_type;
std::cout << primitive_type;
}

Answer 2

In c++, you can't ACTUALLY define your own data type.

Using the "typedef" keyword will only let you CHANGE the name of a pre-defined data type.

Example::

typedef int Number;

the above expression only tells C++ to form a new Keyword called "Number" and use it as another word for "int"

So after typing this ::
typedef int Number;

you'll now be able to do stuff like --->
Number age=17;

Hope it helps