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Constructor With Default Argument In C++

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.

Fig: Constructor With Default Argument In C++

Syntax:

class class name

{

Public:

Classname(datatype variablename=value);

----

----

};

Program:

#include<iostream.h>

#include<conio.h>

class BCA

{

int a,b;

public:

BCA(int x,int y=30);

void display();

};

BCA::BCA(int x,int y)

{

a=x;

 b=y;

}

void BCA:: display()

{

cout<<”a=”<<a;

cout<<”b=”<<b;

}

void main()

{

BCA a1(10);

a1.display();

getch();

}

Output:

a=10 b=30