CONSTRUCTOR WITH DEFAULT ARGUMENTS

Like other functions in C++, constructors can also be defined with default arguments. If an arguments are initialized at the time of constructor declaration/definition, then that type of constructors are called default argument constructor.

            The initialization of arguments at the time of constructor declaration must be in trailing order. And the missing arguments must be the trailing ones.

Program: Illustrate the default argument constructor

#include<iostream>

usage namespace std;

class  power

     {   

                        int  num;

                        int  pwr;

                        int  ans;

            public:

                        power(int   n = 3 , int  p = 2 );

                        void  show( )

                          {

                                    cout<< num <<”power”<< pwr <<”is:”<< ans ;

                          }

       };

    power :: power( int  n,int p)

       {

            num = n;

            pwr = p;

            ans = pow( n , p )   // math pow function

        }

    int  main( )

      {

              clrscr( );        

              power  p1, p2(5);

              p1.show( );

              p2.show( );

              return 0;

        }

    

  Result:

                        3 power 2 is 9

                        5 power 2 is 25

Other recommended posts of Constructor and Destructor

• Constructor
• Default Constructors
• Parameterized Constructors
• Copy Constructors
• Constructor Overloading
• Constructors with Default Arguments
• Dynamic Constructor
• Destructor