C++ PROGRAM QUESTION

Module 10

Question 1A

Complete the prog38.cpp to display random records from the random file.

Question 1B

Extend this to a menu driven program to create a random file, read it sequentially and read it randomly.

PROG38.cc

#include

#include

#include

#include // exit function prototype

#include "ClientData.h" // ClientData class definition

using namespace std;

void outputLine( ostream&, const ClientData & ); // prototype

int main()

{

ifstream inCredit( "credit.dat", ios::in | ios::binary );

// exit program if ifstream cannot open file

if ( !inCredit )

{

cerr << "File could not be opened." << endl;

exit( EXIT_FAILURE );

} // end if

// output column heads

ClientData client; // create record

int r;

cout << "Enter record to read ";

cin >> r;

inCredit.seekg (sizeof(ClientData)*(r-1), ios::cur);

// read first record from file

inCredit.read( reinterpret_cast< char * >( &client ),

sizeof( ClientData ) );

cout << left << setw( 10 ) << "Account" << setw( 16 )

<< "Last Name" << setw( 11 ) << "First Name" << left

<< setw( 10 ) << right << "Balance" << endl;

outputLine( cout, client );

// read next from file

#include

#include

#include

#include // exit function prototype

#include "ClientData.h" // ClientData class definition

using namespace std;

void outputLine( ostream&, const ClientData & ); // prototype

int main()

{

ifstream inCredit( "credit.dat", ios::in | ios::binary );

// exit program if ifstream cannot open file

if ( !inCredit )

{

cerr << "File could not be opened." << endl;

exit( EXIT_FAILURE );

} // end if

// output column heads

ClientData client; // create record

int r;

cout << "Enter record to read ";

cin >> r;

//TODO : Ask three options as first record, last record or the record number

// Read the record based on the user value

inCredit.seekg (sizeof(ClientData)*(r-1), ios::cur);

// read first record from file

inCredit.read( reinterpret_cast< char * >( &client ),

sizeof( ClientData ) );

cout << left << setw( 10 ) << "Account" << setw( 16 )

<< "Last Name" << setw( 11 ) << "First Name" << left

<< setw( 10 ) << right << "Balance" << endl;

outputLine( cout, client );

}

void outputLine( ostream &output, const ClientData &record )

{

output << left << setw( 10 ) << record.getAccountNumber()

<< setw( 16 ) << record.getLastName()

<< setw( 11 ) << record.getFirstName()

<< setw( 10 ) << setprecision( 2 ) << right << fixed

<< showpoint << record.getBalance() << endl;

} // end function outputLine

// end while

} // end main

// display single record

void outputLine( ostream &output, const ClientData &record )

{

output << left << setw( 10 ) << record.getAccountNumber()

<< setw( 16 ) << record.getLastName()

<< setw( 11 ) << record.getFirstName()

<< setw( 10 ) << setprecision( 2 ) << right << fixed

<< showpoint << record.getBalance() << endl;

} // end function outputLine

************************************************************************

// Fig. 14.9: ClientData.h

// Class ClientData definition used in Fig. 14.11-Fig. 14.14.

#ifndef CLIENTDATA_H

#define CLIENTDATA_H

using namespace std;

#include

class ClientData

{

public:

// default ClientData constructor

ClientData( int = 0, const string & = "", const string & = "", double = 0.0 );

// accessor functions for accountNumber

void setAccountNumber( int );

int getAccountNumber() const;

// accessor functions for lastName

void setLastName( const std::string & );

std::string getLastName() const;

// accessor functions for firstName

void setFirstName( const std::string & );

std::string getFirstName() const;

// accessor functions for balance

void setBalance( double );

double getBalance() const;

private:

int accountNumber;

char lastName[ 15 ];

char firstName[ 10 ];

double balance;

}; // end class ClientData

#endif

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