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A constructor is a special method that is created when the object is created or defined. This particular method holds the same name as that of the object and it initializes the instance of the object whenever that object is created. The constructor also usually holds the initializations of the different declared member variables of its object. Unlike some of the other methods, the constructor does not return a value, not even void.
When you create an object, if you do not declare a constructor, the compiler would create one for your program; this is useful because it lets all other objects and functions of the program know that this object exists. This compiler created constructor is called the default constructor. If you want to declare your own constructor, simply add a method with the same name as the object in the public section of the object. When you declare an instance of an object, whether you use that object or not, a constructor for the object is created and signals itself.
A constructor is declared without a return value, that also excludes void.
Therefore, when implemented, do not return a value:
Constructor Exampleclass rectangle { // A simple class int height; int width; public: rectangle(void); // with a constuctor, ~rectangle(void); // and a destructor }; rectangle::rectangle(void) // constuctor { height = 6; width = 6; }sagar sainath samant. sybsc (computer science)
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How many constructors can c have?
A class can have any number of constructors, as far as they are having different parameters or different number of parameters. For example, a class A can have following constructors & even more: A() -the default constructor A(A objectA) -the copy constructor A(int p) A(int p1, int p2) A(int[] p1, float p2) A(double p1, double p2, int p3) A(A objA, int[] p) A(B objB)
How many constructors does class Exception have?
The Exception class has 4 constructors. They are: a. Exception() b. Exception(String arg) c. Exception(String arg, Throwable arg1) d. Exception(Throwable arg)
How do you call multiple constructors with single object?
You can have any number of constructors for a class. All we need to do is implement constructor overloading. Ex: let us say we want to create multiple constructor for a class Test Public class Test { Public Test() { //code } Public Test(int vals) { //code } Public Test(String val) { //code } }
Can you call a constructor from another if a class has multiple constructors?
Yes. All you need to do is to specify the correct number of arguments to invoke the correct constructor.
What is the difference between default constructor and parameterized constructor?
A default constructor is one that has no parameters (C++ also calls constructors with all default parameters a default constructor), while a parameterized constructor is one that has at least one parameter without a default value. Default constructors can be provided by the compiler if no other constructors are defined for that class or any class the class inherits from, while parameterized constructors must always be defined by the developer.
