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ifstream.cpp
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C/C++ Source or Header
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1998-02-09
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160 lines
#include "stlexam.h"
#pragma hdrstop
/***************************************************************************
*
* ifstream.cpp - basic_ifstream example
*
* $Id: ifstream.cpp,v 1.6 1996/09/26 22:47:38 philippe Exp $
*
***************************************************************************
*
* (c) Copyright 1994, 1995 Rogue Wave Software, Inc.
* ALL RIGHTS RESERVED *
* The software and information contained herein are proprietary to, and
* comprise valuable trade secrets of, Rogue Wave Software, Inc., which
* intends to preserve as trade secrets such software and information.
* This software is furnished pursuant to a written license agreement and
* may be used, copied, transmitted, and stored only in accordance with
* the terms of such license and with the inclusion of the above copyright
* notice. This software and information or any other copies thereof may
* not be provided or otherwise made available to any other person.
*
* Notwithstanding any other lease or license that may pertain to, or
* accompany the delivery of, this computer software and information, the
* rights of the Government regarding its use, reproduction and disclosure
* are as set forth in Section 52.227-19 of the FARS Computer
* Software-Restricted Rights clause.
*
* Use, duplication, or disclosure by the Government is subject to
* restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
* Technical Data and Computer Software clause at DFARS 252.227-7013.
* Contractor/Manufacturer is Rogue Wave Software, Inc.,
* P.O. Box 2328, Corvallis, Oregon 97339.
*
* This computer software and information is distributed with "restricted
* rights." Use, duplication or disclosure is subject to restrictions as
* set forth in NASA FAR SUP 18-52.227-79 (April 1985) "Commercial
* Computer Software-Restricted Rights (April 1985)." If the Clause at
* 18-52.227-74 "Rights in Data General" is specified in the contract,
* then the "Alternate III" clause applies.
*
**************************************************************************/
//
// stdlib/examples/manual/ifstream.cpp
//
#include<iostream>
#include<fstream>
#include<iomanip>
#ifndef _RWSTD_NO_NAMESPACE
using namespace std;
#endif
int main ( )
{
long l= 20;
char *ntbs="Le minot passait la piece a frotter";
char c;
char buf[50];
#ifndef _RWSTD_NO_EXCEPTIONS
try {
#endif
// create a read/write file-stream object on char
// and attach it to an ifstream object
ifstream in("ifstream.out",ios_base::in | ios_base::out |
ios_base::trunc);
if ( !in.is_open() )
#ifndef _RWSTD_NO_EXCEPTIONS
throw(ios_base::failure("Open error"));
#else
abort();
#endif
// tie the ostream object to the ifstream object
ostream out(in.rdbuf());
// output ntbs in out
out << ntbs << endl;
// seek to the beginning of the file
in.seekg(0);
// output each word on a separate line
while ( in.get(c) )
{
if ( ifstream::traits_type::eq(c,' ') )
cout << endl;
else
cout << c;
}
cout << endl << endl;
// move back to the beginning of the file
in.seekg(0);
// clear the state flags
in.clear();
// does the same thing as the previous code
// output each word on a separate line
while ( in >> buf )
cout << buf << endl;
cout << endl << endl;
// output the base info before each integer
out << showbase;
ostream::pos_type pos= out.tellp();
// output l in hex with a field with of 20
out << hex << setw(20) << l << endl;
// output l in oct with a field with of 20
out << oct << setw(20) << l << endl;
// output l in dec with a field with of 20
out << dec << setw(20) << l << endl;
// move back to the beginning of the file
in.seekg(0);
// output the all file
cout << in.rdbuf();
// clear the flags
in.clear();
// seek the input sequence to pos
in.seekg(pos);
int a,b,d;
in.unsetf(ios_base::basefield);
// read the previous outputted integer
in >> a >> b >> d;
// output 3 times 20
cout << a << endl << b << endl << d << endl;
#ifndef _RWSTD_NO_EXCEPTIONS
}
catch( ios_base::failure var )
{
cout << var.what();
}
#endif
return 0;
}