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C & C++ Multimedia Cyber Classroom
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C and C++ Multimedia Cyber Classroom (Prentice Hall) (1998).iso
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src
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fig14_08.jar
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Ch14
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Fig14_08
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Fig14_08.cpp
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C/C++ Source or Header
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1997-11-04
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3KB
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102 lines
// Fig. 14.8: fig14_08.cpp
// Credit inquiry program
#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>
#include <stdlib.h>
enum RequestType { ZERO_BALANCE = 1, CREDIT_BALANCE,
DEBIT_BALANCE, END };
int getRequest();
bool shouldDisplay( int, double );
void outputLine( int, const char *, double );
int main()
{
// ifstream constructor opens the file
ifstream inClientFile( "clients.dat", ios::in );
if ( !inClientFile ) {
cerr << "File could not be opened" << endl;
exit( 1 );
}
int request;
int account;
char name[ 30 ];
double balance;
cout << "Enter request\n"
<< " 1 - List accounts with zero balances\n"
<< " 2 - List accounts with credit balances\n"
<< " 3 - List accounts with debit balances\n"
<< " 4 - End of run";
request = getRequest();
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;
}
inClientFile >> account >> name >> balance;
while ( !inClientFile.eof() ) {
if ( shouldDisplay( request, balance ) )
outputLine( account, name, balance );
inClientFile >> account >> name >> balance;
}
inClientFile.clear(); // reset eof for next input
inClientFile.seekg( 0 ); // move to beginning of file
request = getRequest();
}
cout << "End of run." << endl;
return 0; // ifstream destructor closes the file
}
int getRequest()
{
int request;
do {
cout << "\n? ";
cin >> request;
} while( request < ZERO_BALANCE && request > END );
return request;
}
bool shouldDisplay( int type, double balance )
{
if ( type == CREDIT_BALANCE && balance < 0 )
return true;
if ( type == DEBIT_BALANCE && balance > 0 )
return true;
if ( type == ZERO_BALANCE && balance == 0 )
return true;
return false;
}
void outputLine( int acct, const char *name, double bal )
{
cout << setiosflags( ios::left ) << setw( 10 ) << acct
<< setw( 13 ) << name << setw( 7 ) << setprecision( 2 )
<< resetiosflags( ios::left )
<< setiosflags( ios::fixed | ios::showpoint )
<< bal << '\n';
}