fig14_07.cpp

来自「这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to pr」· C++ 代码 · 共 75 行

// 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;

#include <fstream>

using std::ifstream;

#include <iomanip>

using std::setiosflags;
using std::resetiosflags;
using std::setw;
using std::setprecision;

#include <cstdlib>    

void outputLine( int, const char * const, double );

int main()
{
   // ifstream constructor opens the file
   ifstream inClientFile( "clients.dat", ios::in );

   if ( !inClientFile ) {
      cerr << "File could not be opened\n";
      exit( 1 );
   }

   int account;
   char name[ 30 ];
   double balance;

   cout << setiosflags( ios::left ) << setw( 10 ) << "Account" 
        << setw( 13 ) << "Name" << "Balance\n"
        << setiosflags( ios::fixed | ios::showpoint );

   while ( inClientFile >> account >> name >> balance )
      outputLine( account, name, balance );

   return 0;  // ifstream destructor closes the file
}

void outputLine( int acct, const char * const name, double bal )
{
   cout << setiosflags( ios::left ) << setw( 10 ) << acct 
        << setw( 13 ) << name << setw( 7 ) << setprecision( 2 )
        << resetiosflags( ios::left )        
        << bal << '\n';
}




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