C++ LANGUAGE PARAMETRIZED CONSTRUCTOR

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C++ LANGUAGE PARAMETRIZED CONSTRUCTOR

Parameterized Constructor 


A default constructor does not have any parameter, 
but if you need, a constructor can have parameters. 
This helps you to assign initial value to an object 
at the time of its creation as shown in the following example: 


#include <iostream> 
  
using namespace std; 
  
class Line 
{ 
   public: 
      void setLength( double len ); 
      double getLength( void ); 
      Line(double len);  // This is the constructor 
  
   private: 
      double length; 
}; 
  
// Member functions definitions including constructor 
Line::Line( double len) 
{ 
    cout << "Object is being created, length = " << len << endl; 
    length = len; 
} 
  
void Line::setLength( double len ) 
{ 
    length = len; 
} 
  
double Line::getLength( void ) 
{ 
    return length; 
} 
// Main function for the program 
int main( ) 
{ 
   Line line(10.0); 
  
   // get initially set length. 
   cout << "Length of line : " << line.getLength() <<endl; 
   // set line length again 
   line.setLength(6.0);  
   cout << "Length of line : " << line.getLength() <<endl; 
  
   return 0; 
} 
When the above code is compiled and executed, 
it produces the following result: 

Object is being created, length = 10 
Length of line : 10 
Length of line : 6