fige_03.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. E.3: figE_03.cpp
// Using command-line arguments
#include <iostream>
using std::cout;
using std::endl;
using std::ios;

#include <fstream>
using std::ifstream;
using std::ofstream;

int main( int argc, char *argv[] )
{
   // check number of command-line arguments
   if ( argc != 3 )
      cout << "Usage: copyFile infile_name outfile_name" << endl;
   else
   {
      ifstream inFile( argv[ 1 ], ios::in );

      // input file could not be opened
      if ( !inFile )
      {
         cout << argv[ 1 ] << " could not be opened" << endl;
         return -1;
      }  // end if

      ofstream outFile( argv[ 2 ], ios::out );

      // output file could not be opened
      if ( !outFile )
      {
         cout << argv[ 2 ] << " could not be opened" << endl;
         inFile.close();
         return -2;
      } // end if

      char c = inFile.get(); // read first character

      while ( inFile )
      {
         outFile.put( c );   // output character
         c = inFile.get();   // read next character
      }  // end while
   }  // end else

   return 0;
}  // end main

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 * (C) Copyright 1992-2005 by Deitel & Associates, Inc. and               *
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