C++

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File Processing

Given the following program, show the changes that would be necessary to convert to random file input and allow users to select (from a keyboard prompt) a list of records they would like to print. (e.g., user entry => 2 5 6 7 would print records 2,5,6, and 7)

// Reading and printing a sequential file

#include

#include

#include

#include

#include

using namespace std;

void outputLine( int, const string &, double );

int main()

{

// ifstream constructor opens the file

ifstream inClientFile( "clients.txt", ios::in );

if ( !inClientFile ) {

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

exit( EXIT_FAILURE );

}

int account;

string name;

double balance;

cout << left << setw( 10 ) << "Account" << setw( 13 )

<< "Name" << "Balance" << endl << fixed << showpoint;

while ( inClientFile >> account >> name >> balance )

outputLine( account, name, balance );

}

void outputLine( int account, const string &name, double balance )

{

cout << left << setw( 10 ) << account << setw( 13 ) << name

<< setw( 7 ) << setprecision( 2 ) << right << balance << endl;

}