Technical Interview Questions and Answers :: Societe Generale

No Discussion on this question yet!

Yes, struct is similar to class, only all attributes/methods are public by default in the struct. You can very well have methods and attributes in a struct. You can also inherit from a struct (default inheritance is public).

Yes, Size of an empty class is not zero. It is 1 byte generally. It is nonzero to ensure that the two different objects will have different addresses.

Copy constructor is used to declare and initialize an object from another object.
For example, the statement
Integer I2(I1);
Would define the object I2 and at the same time initialize it to the values of I1. another form of this statement is integer I2=I1;
The process of initializing through a copy constructor is known as copy initialization. A copy constructor takes a reference to an object of the same class as itself as an argument.

No Discussion on this question yet!

Syntax:

void operator delete(void *p)
{
/*free memory pointed to by p. the destructor is called automatically.*/
}

The delete function receives a pointer to the region of memory to be freed. It then releases the previously allocated memory back to the system. When an object is deleted, its destructor is automatically called.

A constructor that accepts no parameters is called the default constructor. The default constructor for class A is A::A ( ). If no such constructor is defined, then the compiler supplies a default constructor. Therefore a statement such as A a;
Invokes the default constructor of the compiler to create the object a.

A constructor is declared and defined as

Class integer
{
int m,n;
public:
integer(void); //constructor declared
……….
………..
};
integer : : integer(void)//constructor defined
{
m=0;
n=0;
}