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Answered 2011-01-31 23:53:08

Default, Copy, Conversion, Implied (a case of default).

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This constructor is used to allocate the memory to the objects at the run time..



An implicit constructor call will always call the default constructor, whereas explicit constructor calls allow to chose the best constructor and passing of arguments into the constructor.


Constructor creates an instance of class, destructor destroys it.


There is no specific keyword for a constructor in C++. Simply define and declare a method of the class with the same name as the class and it will be a constructor. A constructor with no arguments is the default constructor, a constructor with one argument of class type is the copy constructor, and a constructor with one argument of some other type is the conversion constructor. You can provide other overloaded constructors if you want.



That depends on how you define body of class. If you do not define constructors then compiler will provide default constructor and it is not overloaded. If you create your own constructor you automatically overload default constructor.


A constructor is a method that fires when the object is instantiated. A friend function is a function that has special access to the object. They are two different types of things, and cannot be further differenced.


The C++ struct and class keywords are exactly the same; they are both used to declare classes. The only practical difference is that struct data types default to public access and public visibility mode while class data types default to private access and private visibility mode. This allows C++ to interact with C struct data types just as if they were C++ classes declared with a compiler-generated default constructor, copy constructor and assignment operator.


A constructor creates the initial state of a collection of data. A function modifies or queries the data after it has been initialized.


Yes, you can use, and often you should, use more than one constructor in a class in C++. Normally, there is a default constructor, a copy constructor, and one or more conversion constructors. Sometimes, there are also other constructors, overloaded based on argument signature, if there are complex situations.


Yes. Depending on the signature (argument list) there can be several different constructors. The default constructor takes no arguments, the copy constructor takes one argument of class type, and the conversion constructor takes one argument of non-class type. Other constructors take more than one argument. Any constructor can have default parameters, making it possible for different types of constructors to share the same code body.


i think we don't have any constructor in c, cause c is not an object oriented programming language..


Yes, C++ has data types.


A default constructor is a constructor that takes no arguments.Here's a sample:class c{int a,b;c() //Constructor 1{a=2;b=1;}c(int x, int y) //Constructor 2{a=x;b=y;}};Here, Constructor 1 is called the default constructor, while Constructor 2 is a parameterized constructor.


No. Constructors initialise objects and, by definition, must be able to modify the member variables. Uninitialised members are a disaster waiting to happen even without a constructor declared const! Thankfully, the compiler won't permit a const constructor.


Default Constructor Parameterised Constructor Non Parameterised Constructor


Constructor overloading, just like any function's overloading, is where more than one configuration of parameters exists for the function. Based on the number and type of the parameters, different versions of the function can be resolved by the linker. This is typically used in the constructor as the default constructor (no parameters), the copy constructor (one reference parameter of the same type as the class), and the conversion constructor (any other combination of parameters).


Compared with what? There are no merits or demerits. Construction is the only way to initialise an instance of a class.


There is no such thing as a constructor function in C++ (constructors have no return value, not even void, and cannot be called like regular functions). Constructors are invoked rather than called directly, either by declaring a static variable of the class type, or via the C++ new operator.


The constructor is the first function that is called by default when you create an object of a class. The importance of constructor is as follows: 1. It lets you initialize the members of the class or default memory allocation for the class 2. It helps you to perform certain operations that you would like to be done when an object of the class is created. Also based on the types of constructor the need varies, like Default constructor is in built constructor that would define the member variable without any initialization value. A Parameter constructor allows the user to pass arguments to the constructor and hence perform certain operations as per user requirement. A copy constructor would allow you to copy an object of a class with another and hence avoiding the need of explicit copying the elements.


Every class, including abstract classes, MUST have a constructor. The different types are: a. Regular constructors b. Overloaded constructors and c. Private constructors


In a class, the Destructor is like the opposite of the Constructor. The Constructor is run when an object of the class is created (usually to set up the variables as needed), and the Destructor is run when it is destroyed (usually to clean up or delete variables).


It cannot. Inheritance is a compile-time operation. Constructors are invoked at runtime at the point of instantiation.


Casting is the conversion of one type to another type, better known as a type cast. A class constructor that accepts one argument is a conversion constructor because it converts its argument to an object of the class. However, if the argument is of the same type as the class then it is known as a copy constructor.