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// Fig. 17.8: Fig17_08.cpp
// Credit inquiry program.
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cstdlib> // exit function prototype
using namespace std;
enum RequestType { ZERO_BALANCE = 1, CREDIT_BALANCE, DEBIT_BALANCE, ADD_ACCOUNT, END };
int getRequest();
bool shouldDisplay( int, double );
void outputLine( int, const string, double );
int main()
{
//ofstream outClientFile( "clients.txt",ios::out );
// ifstream constructor opens the file
ifstream inClientFile( "clients.txt", ios::in );
// exit program if ifstream could not open file
if ( !inClientFile )
{
cerr << "File could not be opened" << endl;
exit( 1 );
} // end if
int request;
int account;
string name;
double balance;
// get user's request (e.g., zero, credit or debit balance)
request = getRequest();
// process user's request
while ( request != END )
{
switch ( request )
{
case ZERO_BALANCE:
cout << "\nAccounts with zero balances:\n";
break;
case CREDIT_BALANCE:
cout << "\nAccounts with credit balances:\n";
break;
case DEBIT_BALANCE:
cout << "\nAccounts with debit balances:\n";
break;
case ADD_ACCOUNT:
cout << "\nAdd Account\n";
//inClientFile.close();
ofstream outClientFile( "clients.txt", ios::out | ios::ate );
int newaccount ;
string newname;
double newbalance ;
cout << "Enter the account, name, and balance." << endl;
cin >> newaccount >> newname >> newbalance;
cout << endl;
outClientFile cout << left << setw( 10 ) << newaccount << setw( 13 ) << newname
<< setw( 7 ) << setprecision( 2 ) << right << newbalance << endl;
cout << endl;
outClientFile.clear();
outClientFile.close();
break;
} // end switch
// read account, name and balance from file
inClientFile >> account >> name >> balance;
// display file contents (until eof)
while ( !inClientFile.eof() )
{
// display record
if ( shouldDisplay( request, balance ) )
outputLine( account, name, balance );
// read account, name and balance from file
inClientFile >> account >> name >> balance;
} // end inner while
inClientFile.clear(); // reset eof for next input
inClientFile.seekg( 0 );
request = getRequest(); // get additional request from user
} // end outer while
cout << "End of run." << endl;
} // end main
// obtain request from user
int getRequest()
{
int request; // request from user
// display request options
cout << "\nEnter request" << endl
<< " 1 - List accounts with zero balances" << endl
<< " 2 - List accounts with credit balances" << endl
<< " 3 - List accounts with debit balances" << endl
<< " 4 - Add Account" << endl
<< " 5 - End of run" << fixed << showpoint;
do // input user request
{
cout << "\n? ";
cin >> request;
} while ( request < ZERO_BALANCE && request > END );
return request;
} // end function getRequest
// determine whether to display given record
bool shouldDisplay( int type, double balance )
{
// determine whether to display zero balances
if ( type == ZERO_BALANCE && balance == 0 )
return true;
// determine whether to display credit balances
if ( type == CREDIT_BALANCE && balance < 0 )
return true;
// determine whether to display debit balances
if ( type == DEBIT_BALANCE && balance > 0 )
return true;
return false;
} // end function shouldDisplay
// display single record from file
void outputLine( int account, const string name, double balance )
{
cout << left << setw( 10 ) << account << setw( 13 ) << name
<< setw( 7 ) << setprecision( 2 ) << right << balance << endl;
} // end function outputLine
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