rectangle.cpp

《c＋＋大学教程实验指导书》源码

// rectangle.cpp
// member function definitions for rectangle.cpp

#include "rectangle.h"

// constructor
Rectangle::Rectangle( double w, double l )
{
   setWidth( w );
   setLength( l );

} // end class Rectangle constructor

// function perimeter definition
double Rectangle::perimeter() 
{ 
	return 2 * ( width + length ); 

} // end function perimeter

// function area definition
double Rectangle::area() 
{ 
	return width * length; 

} // end function area

// set width
void Rectangle::setWidth( double w ) 
{ 
	width = w > 0 && w < 20.0 ? w : 1.0; 

} // end function setWidth

// set length
void Rectangle::setLength( double l ) 
{ 
	length = l > 0 && l < 20.0 ? l : 1.0; 

} // end function setLength

// return width
double Rectangle::getWidth() 
{ 
   return width; 

} // end function getWidth

// return length
double Rectangle::getLength() 
{ 
   return length; 

} // end function getLength

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