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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp | |
| download | Studium-33613a85afc4b1481367fbe92a17ee59c240250b.tar.gz Studium-33613a85afc4b1481367fbe92a17ee59c240250b.tar.bz2 | |
Diffstat (limited to 'Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp')
| -rw-r--r-- | Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_08.cpp | 163 |
1 files changed, 163 insertions, 0 deletions
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 <iostream>
+
+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 <fstream>
+
+using std::ifstream;
+
+#include <iomanip>
+
+using std::setw;
+using std::setprecision;
+
+#include <cstdlib>
+
+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. *
+ *************************************************************************/
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