fig14_07.cpp

来自「经典vc教程的例子程序」· C++ 代码 · 共 43 行

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

void outputLine( int, const char *, 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";

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

   return 0;  // ifstream destructor closes the file
}

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