Parameterized Constructor in C++

mahendragohil.gohil@gmail.com

The constructors that can take arguments are called parameterized constructors. Using parameterized constructor we can initialize the various data elements of different objects with different values when they are created.

Example:

class item
{
      int m,n;
public:
      item(int x, int y)
      {
         m=x;
         n=y;
      }
};

When a constructor has been parameterized, the object declaration statement such as item t; may not work.

We must pass the initial values as arguments to the constructor function when an object is declared. This can be done in 2 ways:

item t=item(10,20); //explicit call
item t(10,20); //implicit call

Example:

#include<iostream.h>
#include<conio.h>
class item
{
     int m,n;
public:
     item(int x,int y)
     {
         m=x;
         n=y;
     }
     void put();
};
 void item::put()
 {
    cout<<m<<n;
 }
 void main()
 {
      item t1(10,20);
      item t2=item(20,30);
      t1.put();
      t2.put();
      getch();
}

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