cpp16.cpp

C++参考书

// Coded by plusir -- Dec.27.2002.
// Standard C++ Bible -- (P134-5-16)

#include <iostream>
using namespace std ;

union Holder
{
	char holdChar ;
	short holdInt ;
	long holdLong ;
	double holdDouble ;
} ;

void displayHolder( Holder, char * ) ;

int main()
{
	Holder hld ;

	hld.holdChar = 'X' ;
	displayHolder( hld, "char" ) ;

	hld.holdInt = 12345 ;
	displayHolder( hld, "int" ) ;

	hld.holdLong = 7654321 ;
	displayHolder( hld, "long" ) ;

	hld.holdDouble = 1.23 ;
	displayHolder( hld, "double" ) ;

	return 0 ;
}

void displayHolder( Holder hld, char *title )
{
	cout << "---Initalized " << title << "---" << endl ;
	cout << "holdChar = " << hld.holdChar << endl ;
	cout << "holdInt = " << hld.holdInt << endl ;
	cout << "holdLong = " << hld.holdLong << endl ;
	cout << "holdDouble = " << hld.holdDouble << endl ;
}