The constructor in C++ is a function that runs when an object is created. It is used to initialize the object.
Types of constructors include default constructors (no arguments), copy constructor (one argument of same type as object), conversion constructors (one argument of some other type), and other constructors (all other cases).
If you do not provide a default constructor, the object will not be initialized.
If you do not provide a copy constructor, the compiler will blindly copy the attributes of the old object into the new object whenever a copy is made, such as in a function call with the object as an argument. This may or may not be safe, especially if any of the attributes are pointers, because that creates the situation of two pointers to the same region of memory. In that case, if that region of memory is an object, then when the object is destroyed, so will the pointed to object, and that will leave the original copied object in an invalid state, with its pointers referencing deleted memory.
True - A C++ constructor cannot return a value.
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.
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.
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 of a Java class is not an ordinary method. Its purpose is not to return any value. The purpose of the constructor is to instantiate the class which it does. Since, the purpose of a constructor is only to instantiate and initialize its class and not anything else, it does not have a return type. All it does is creates an object of that class.
Yes.
True - A C++ constructor cannot return a value.
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.
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.
You cannot copy constructor addresses because they are not functions. They have no return type and you cannot call them directly, so it makes no sense whatsoever to point at them. They are invoked automatically whenever you instantiate an object of the type, and that's all they will ever need to do. Pointing at them would serve no purpose, so the language simply does not allow it.
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.
It cannot. Inheritance is a compile-time operation. Constructors are invoked at runtime at the point of instantiation.
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.
Computer programming.
The constructor of a Java class is not an ordinary method. Its purpose is not to return any value. The purpose of the constructor is to instantiate the class which it does. Since, the purpose of a constructor is only to instantiate and initialize its class and not anything else, it does not have a return type. All it does is creates an object of that class.
Not possible in C.
what is the purpose of the construction industry