Define objects and show how they act as user defined data type in c plus plus with the help of a programme?

Answer 1

An object is an instance of a class. A class is a data type that combines data and the specific methods that operate upon that data into a self-contained entity.

To prove that objects are user-defined types, consider the following:

class foo

{

};

int main()

{

foo a;

foo b;

foo c = a + b; // ERROR!

}

The reason there is an error is because the plus operator (+) only works with primitive data types (integral, arithmetic and built-in data types). foo is neither an integral, arithmetic nor built-in data type, thus the plus operator is not supported.

However, if you provide a user-defined plus operator overload (foo::operator+) that accepts a constant reference to a foo object, the code will compile. It's up to you, the class designer, to provide the appropriate implementation.