The objects of a class can be referenced by passing objects as function arguments. The passing objects as function arguments can be pass by value or pass by reference.
Example;
In the above example, rup is the class, n1 and n2 are data members, multi() is member function with r1, r2 are the function argument of object type. The line obj3.multi (obj1, obj2); pass obj1 and obj2 which are the objects of class rup type. This type of function call is called call by value.
