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C++

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

Syntax:
class A
{
 int a;

A(int a) //parameterized constructor
{
 a=0;
}
}


Example:

#include 
 
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() <


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