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istream1.cpp
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C/C++ Source or Header
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1998-02-09
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147 lines
#include "stlexam.h"
#pragma hdrstop
/***************************************************************************
*
* istream1.cpp - istream example
*
* $Id: istream1.cpp,v 1.6 1996/09/26 22:58:33 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/istream1.cpp
//
#include<iostream>
#include<istream>
#include<fstream>
#ifndef _RWSTD_NO_NAMESPACE
using namespace std;
#endif
int main ( )
{
float f= 3.14159;
int i= 3;
char s[200];
// open a file for read and write operations
ofstream out("example", ios_base::in | ios_base::out
| ios_base::trunc);
// tie the istream object to the ofstream filebuf
istream in (out.rdbuf());
// output to the file
out << "Annie is the Queen of porting" << endl;
out << f << endl;
out << i << endl;
// seek to the beginning of the file
in.seekg(0);
f = i = 0;
// read from the file using formatted functions
in >> s >> f >> i;
// seek to the beginning of the file
in.seekg(0,ios_base::beg);
// output the all file to the standard output
cout << in.rdbuf();
// seek to the beginning of the file
in.seekg(0);
// read the first line in the file
// "Annie is the Queen of porting"
in.getline(s,100);
cout << s << endl;
// read the second line in the file
// 3.14159
in.getline(s,100);
cout << s << endl;
// seek to the beginning of the file
in.seekg(0);
// read the first line in the file
// "Annie is the Queen of porting"
in.get(s,100);
// remove the newline character
in.ignore();
cout << s << endl;
// read the second line in the file
// 3.14159
in.get(s,100);
cout << s << endl;
// remove the newline character
in.ignore();
// store the current file position
istream::pos_type position = in.tellg();
out << "replace the int" << endl;
// move back to the previous saved position
in.seekg(position);
// output the remain of the file
// "replace the int"
// this is equivalent of
// cout << in.rdbuf();
while( !ifstream::traits_type::eq_int_type( in.peek(),
ifstream::traits_type::eof()) )
cout << ifstream::traits_type::to_char_type(in.get());
cout << "\n\n\n" << flush;
return 0;
}