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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_13.cpp | |
| download | Studium-33613a85afc4b1481367fbe92a17ee59c240250b.tar.gz Studium-33613a85afc4b1481367fbe92a17ee59c240250b.tar.bz2 | |
Diffstat (limited to 'Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_13.cpp')
| -rw-r--r-- | Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_13.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_13.cpp b/Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_13.cpp new file mode 100644 index 0000000..fefa264 --- /dev/null +++ b/Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_13.cpp @@ -0,0 +1,94 @@ +// Fig. 14.13: fig14_13.cpp
+// Writing to a random access file.
+#include <iostream>
+
+using std::cerr;
+using std::endl;
+using std::cout;
+using std::cin;
+using std::ios;
+
+#include <iomanip>
+
+using std::setw;
+
+#include <fstream>
+
+using std::ofstream;
+
+#include <cstdlib>
+#include "clientData.h" // ClientData class definition
+
+int main()
+{
+ int accountNumber;
+ char lastName[ 15 ];
+ char firstName[ 10 ];
+ double balance;
+
+ ofstream outCredit( "credit.dat", ios::binary );
+
+ // exit program if ofstream cannot open file
+ if ( !outCredit ) {
+ cerr << "File could not be opened." << endl;
+ exit( 1 );
+
+ } // end if
+
+ cout << "Enter account number "
+ << "(1 to 100, 0 to end input)\n? ";
+
+ // require user to specify account number
+ ClientData client;
+ cin >> accountNumber;
+ client.setAccountNumber( accountNumber );
+
+ // user enters information, which is copied into file
+ while ( client.getAccountNumber() > 0 &&
+ client.getAccountNumber() <= 100 ) {
+
+ // user enters last name, first name and balance
+ cout << "Enter lastname, firstname, balance\n? ";
+ cin >> setw( 15 ) >> lastName;
+ cin >> setw( 10 ) >> firstName;
+ cin >> balance;
+
+ // set record lastName, firstName and balance values
+ client.setLastName( lastName );
+ client.setFirstName( firstName );
+ client.setBalance( balance );
+
+ // seek position in file of user-specified record
+ outCredit.seekp( ( client.getAccountNumber() - 1 ) *
+ sizeof( ClientData ) );
+
+ // write user-specified information in file
+ outCredit.write(
+ reinterpret_cast< const char * >( &client ),
+ sizeof( ClientData ) );
+
+ // enable user to specify another account number
+ cout << "Enter account number\n? ";
+ cin >> accountNumber;
+ client.setAccountNumber( accountNumber );
+
+ } // end while
+
+ return 0;
+
+} // end main
+
+/**************************************************************************
+ * (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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