square.cpp

《c＋＋大学教程实验指导书》源码

// square.cpp
// member functions for class Square
#include <iostream> 

using std::cout; 
using std::fixed;

#include <iomanip> 
 
using std::setprecision; 

#include "square.h"

// default constructor
Square::Square( double xValue, double yValue, double zValue, double sideValue ) 
   : Point( xValue, yValue, zValue )
{ 
   setSide( sideValue ); 

} // end class Square constructor

// function setSide definition
void Square::setSide( double sideValue ) 
{ 
   side = sideValue > 0 && sideValue <= 20.0 ? sideValue : 1.0; 

} // end function setSide

// return side
double Square::getSide() const 
{ 
   return side; 

} // end function getSide

// function area definition
double Square::area() const 
{ 
   return side * side; 

} // end function area

// function print definition
void Square::print() const
{
   cout << fixed
        << "The lower left coordinate of the square is: ["
        << setprecision( 2 ) << getX() << ", " << setprecision( 2 )
        << getY() << ", " << setprecision( 2 ) << getZ() << ']'
        << "\nThe square side is: " << setprecision( 2 ) << side
        << "\nThe area of the square is: " << setprecision( 2 )
        << area() << '\n';
       
} // end function print

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