fig14_07.cpp

《c＋＋大学教程》源码

// Fig. 14.7: fig14_07.cpp
// Reading and printing a sequential file.
#include <iostream>

using std::cout;
using std::cin;
using std::ios;
using std::cerr;
using std::endl;
using std::left;
using std::right;
using std::fixed;
using std::showpoint;

#include <fstream>

using std::ifstream;

#include <iomanip>

using std::setw;
using std::setprecision;

#include <cstdlib> // exit prototype

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 account;
   char name[ 30 ];
   double balance;

   cout << left << setw( 10 ) << "Account" << setw( 13 ) 
        << "Name" << "Balance" << endl << fixed << showpoint;

   // display each record in file
   while ( inClientFile >> account >> name >> balance )
      outputLine( account, name, balance );

   return 0; // ifstream destructor closes the file

} // end main

// 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

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 * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice      *
 * Hall. All Rights Reserved.                                             *
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