ssn.h

C++参考书

#ifndef SSN_H
#define SSN_H

#include <iostream>
using namespace std ;

class SSN
{
	public:
		explicit SSN( long unsigned int = 0 ) ;

		friend ostream& operator << ( ostream &, const SSN & ) ;
		
	private:
		long unsigned int ssn ;
} ;

SSN::SSN( long unsigned int sn ) : ssn( sn )
{
	if ( ssn > 999999999l )
		ssn = 0 ;
}

ostream& operator << ( ostream &os, const SSN &s )
{
	int lssn = s.ssn / 1000000l ;
	int mssn = ( s.ssn - ( lssn * 1000000l ) ) / 10000 ;
	int rssn = s.ssn - ( lssn * 1000000l ) - ( mssn * 10000 ) ;
	cout << lssn << '-' << mssn << '-' << rssn ;

	return os ;
}

#endif