money.h

C++参考书

#ifndef MONEY_H
#define MONEY_H

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

class Money
{
	public:
		Money( double = 0 ) ;
		operator double( void ) const
		{ return value ; }
		friend ostream& operator << ( ostream&, const Money & ) ;

	private:
		double value ;
} ;

Money::Money( double val )
{
	long int nval = static_cast<long int>( ( val + 0.05 ) * 100 ) ;
	float cents = nval % 100 ;
	cents /= 100 ;
	value = ( nval / 100 ) + cents ;
}

ostream& operator << ( ostream &os, const Money &curr )
{
	os << '$'
	   << setprecision( 2 )
	   << setiosflags( ios::fixed )
	   << curr.value ;
}

#endif