Constructor with default parameters in C++

Published: 09 October 2020
on channel: fundavibes

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Constructor is used to construct the values at the time of object creation..

whenever objects are created ,the constructor function will be invoked automatically.
Characteristics of Constructor
1. It is a member function which is declared in public part of class.
2. Constructor name is same as class name.
3. Whenever objects are created ,the constructor function will be invoked automatically.
4. They do not have return type.
5. Constructors can have default arguments.

Types of Constructors
Default Constructor
Parameterized Constructor
1.Constructor with one parameter
2.Constructor with two parameters
3.Constructor with default parameters
Copy Constructor

CONSTRUCTOR WITH DEFAULT PARAMETERS
A default argument is a value provided in a function declaration that is automatically assigned by the compiler if the caller of the function doesn’t provide a value for the argument with a default value
It is possible to have a constructor with default arguments.
It means that if the constructor is defined with n parameters, we can invoke it with less than n arguments specified in the call.

Ex: 1 Date (int d, int m, int y=2020)

Characteristics of Default Arguments

Default arguments are assigned from right to left.

Default arguments are different from constant arguments as constant arguments can't be changed whereas default arguments can be overwritten if required.

During calling of function, arguments from calling function to called function are copied from left to right.

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