Explain about parameterized Constructor ?

A default constructor does not have any paramter 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 constructorLine::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 programint 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 following result:Object is being created, length = 10Length of line : 10Length of line : 6