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_13.cpp | 94 ++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_13.cpp (limited to 'Bachelor/Prog2/Codebeispiele/4_ch14/Fig14_13.cpp') 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 + +using std::cerr; +using std::endl; +using std::cout; +using std::cin; +using std::ios; + +#include + +using std::setw; + +#include + +using std::ofstream; + +#include +#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. * + *************************************************************************/ \ No newline at end of file -- cgit v1.2.3