From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp | 163 +++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp (limited to 'Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp') diff --git a/Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp b/Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp new file mode 100644 index 0000000..ec49dee --- /dev/null +++ b/Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp @@ -0,0 +1,163 @@ +// Fig. 14.8: fig14_08.cpp +// Credit inquiry program. +#include + +using std::cout; +using std::cin; +using std::ios; +using std::cerr; +using std::endl; +using std::fixed; +using std::showpoint; +using std::left; +using std::right; + +#include + +using std::ifstream; + +#include + +using std::setw; +using std::setprecision; + +#include + +enum RequestType { ZERO_BALANCE = 1, CREDIT_BALANCE, + DEBIT_BALANCE, END }; +int getRequest(); +bool shouldDisplay( int, double ); +void outputLine( int, const char * const, double ); + +int main() +{ + // ifstream constructor opens the file + ifstream inClientFile( "clients.dat", 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; + char name[ 30 ]; + 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; + + } // 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 ); // move to beginning of file + request = getRequest(); // get additional request from user + + } // end outer while + + cout << "End of run." << endl; + + return 0; // ifstream destructor closes the file + +} // end main + +// obtain request from user +int getRequest() +{ + int request; + + // display request options + cout << "Enter request" << endl + << " 1 - List accounts with zero balances" << endl + << " 2 - List accounts with credit balances" << endl + << " 3 - List accounts with debit balances" << endl + << " 4 - End of run" << fixed << showpoint; + + // input user request + do { + 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 credit balances + if ( type == CREDIT_BALANCE && balance < 0 ) + return true; + + // determine whether to display debit balances + if ( type == DEBIT_BALANCE && balance > 0 ) + return true; + + // determine whether to display zero balances + if ( type == ZERO_BALANCE && balance == 0 ) + return true; + + return false; + +} // end function shouldDisplay + +// display single record from file +void outputLine( int account, const char * const name, + double balance ) +{ + cout << left << setw( 10 ) << account << setw( 13 ) << name + << setw( 7 ) << setprecision( 2 ) << right << balance + << endl; + +} // end function outputLine + +/************************************************************************** + * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice * + * Hall. All Rights Reserved. * + * * + * DISCLAIMER: The authors and publisher of this book have used their * + * best efforts in preparing the book. These efforts include the * + * development, research, and testing of the theories and programs * + * to determine their effectiveness. The authors and publisher make * + * no warranty of any kind, expressed or implied, with regard to these * + * programs or to the documentation contained in these books. The authors * + * and publisher shall not be liable in any event for incidental or * + * consequential damages in connection with, or arising out of, the * + * furnishing, performance, or use of these programs. * + *************************************************************************/ \ No newline at end of file -- cgit v1.2.3