cpp06.cpp

C++参考书

// Coded by plusir -- Jan.07.2003.
// Standard C++ Bible -- (P370-12-6)

#include <iostream>
#include <string>
using namespace std ;

class ItemQty
{
	public:
		ItemQty( int oh, char *d )
		{
			onhand = oh ;
			strcpy( desc, d ) ;
		}

		void display( void ) const
		{
			cout << endl << desc << ": " << onhand << endl ;
		}

		int operator - ( void ) const
		{
			return -onhand ;
		}

	private:
		int onhand ;
		char desc[25] ;
} ;

int main()
{
	ItemQty item1( 100, "crankshaft" ) ;
	ItemQty item2( -50, "driveshaft" ) ;

	item1.display() ;
	cout << -item1 << endl ;

	item2.display() ;
	cout << -item2 << endl ;

	return 0 ;
}