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| Submitted on: 12/5/2000 11:04:50 AM
By: *LuckY*
Level: Beginner
User Rating:
By 13 Users
Compatibility:C++ (general)
Users have accessed this code 30474 times.
| (About the author) |
| | | This demonstrates an example of C++'s fstream File I/O. Very simple; the basic stuff for beginners to learn from. If you would like to see how to do something more in the direction this code leads, comment on (and rate) it telling me what specifically you want to see and I'll be glad to suffice.
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//**************************************
//
// Name: C++ File I/O Examples
// Description:This demonstrates an exam
// ple of C++'s fstream File I/O. Very simp
// le; the basic stuff for beginners to lea
// rn from. If you would like to see how to
// do something more in the direction this
// code leads, comment on (and rate) it tel
// ling me what specifically you want to se
// e and I'll be glad to suffice.
// By: *LuckY*
//
//This code is copyrighted and has// limited warranties.Please see http://
// www.Planet-Source-Code.com/xq/ASP/txtCod
// eId.930/lngWId.3/qx/vb/scripts/ShowCode.
// htm//for details.//**************************************
//
//
// lucky760@yahoo.com
//
#include <fstream>
const char *FILENAME = "FILE.txt";
int main() {
//create output object associated w/ file
ofstream fout(FILENAME);
cout << "Enter your secret password: ";
char str[60];
cin >> str;
//write to file
fout << "This is your secret password. Don't give it to anyone!\n";
fout << str;
//close file
fout.close();
cout << endl;
ifstream fin(FILENAME);
char ch;
while (fin.get(ch))
cout << ch;
fin.close();
return 0;
}
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Other 18 submission(s) by this author
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| Other User Comments |
12/6/2000 10:12:13 PM:Dvad78
Nice code, Could you show a little more
file input?
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12/8/2000 11:14:17 PM:Philip Neil
Hey *Lucky* I am a newbie C++ but I
have a rough idea about whats going on
here. const char *FILENAME =
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12/8/2000 11:19:25 PM:philip neil
ok lets try that again.. In do this and
edit the const to the path but it
doesn't write to the file. Can u help
me man
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12/11/2000 7:08:20 PM:Jim
Hi Lucky, I am a moderate programmer
right now, and I under stand "ofstream"
and "ifstream", but could you tell me
how to interactivley take input from
the file and edit at the same time; for
example i am reading a file, and i
tell the program to stop when it finds
a space, that is easy, but i want to be
able to replace that space with a
comma. Any Ideas? Your help would be
appreciated (jimfinn@marist.net)
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12/24/2000 6:55:26 PM:Dennis Wrenn
Hello Jim, I think what you want is the
seekp member of the ofstream class
you
find the position of a space, however
you are doing that, then you
do:
fstream f("example.txt", ios::in |
ios::out);
//do find
stuff...
f.seekp(pos);
f <<
",";
f.close()
simple :-)
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1/21/2001 4:34:00 PM:Liam
hey you forgot to include
iostream.h
but other wise it's cool, i
don't suppose you could help me, i've
been trying to create a program that
will let you enter a file name for the
input
thanx Ü
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1/23/2001 5:32:45 PM:*LuckY*
Most newer compilers, Liam, don't
require you to include <iostream> if
<fstream> is already included. That's
the reason for its absence.
To enter
your own name for a file do something
like this:
char str[20];
cout <<
"Enter filename:
";
cin.getline(str,20);
ofstream
f(str);
hth
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1/24/2001 4:05:23 PM:Tom
Hey man... good code, I think I
understand it well enough to utilize
it. I was wondering, though, how might
I output the values of variables to a
file, then, later on, read those values
back into the variables? Example: I
have two int variables, first and
second. first = 32 and second = 12. I
want to output these two variables to
the same file, then be able to read
them back in (say, if I changed the
values and wanted to change them back
to whatever their value in the file
was).
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1/24/2001 4:41:57 PM:*LuckY*
Tom:
do something like the
following:
//do file stuff first of
course
int x=32,y=12;
fout << x <<
endl; //don't forget the endl
fout <<
y << endl;
int a,b;
fin >> a;
fin >>
b;
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3/28/2001 8:16:48 PM:Ice man
Sorry about that above. I don't know
what went wrong. Anyways, if someone
could explain WHY or HOW the fstream
works, I would greatly apreciate it. I
understand how to use it, but I don't
understand how it works
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4/11/2001 3:35:48 PM:Jason
I want to read a file using fstream,
but my input file is , delimited not
space delimited. How should I read each
field in my file with >>? Thanks
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4/22/2001 5:43:01 PM:bar
Hi. I am working on a school project,
and I have to keep some data in binary
files (names and phone numbers of
customers, descriptions of classes in a
gym, etc). Is there any way you could
explain the major difference between
I/O of normal text files and I/O of
binary files? This is like a sink or
swim project and I am kind of lost...I
have only worked with .txt files so
far. Thank you.
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4/26/2001 11:27:48 PM:Charlie
I'd like to write a program that
displays 10 lines of output from a file
and then pauses untill the user strikes
a key to show the next 10 lines of
code, (etc. etc.) until the it reaches
the eof? Can you help me?
Thanks
Charlie
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5/10/2001 8:12:53 AM:toasthouse
I like this beginning code. I'm new to
C and am trying to learn how to grab
a string variable from a dat file and
then create another dat file with the
extracted string variable from the
first dat file. Any suggestions?
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5/10/2001 8:20:00 AM:mom
I am new to C++ and I am trying to
write a program that will open a dat
file(containing name and id on one
line), read the id and then write the
name to a new dat file. I've gotten the
program to read the file but I can't
figure out how to close the read.dat
file , move the name info to a new dat
file and display it or print it. Can
you offer any suggestions to help me?
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6/20/2001 8:59:01 AM:scrump
ok i understand how to use fstream.h.
but last night i made the switch to
linux only, windows98 installed and
wouldnt boot! lol but, the ios modes
included in the borland package and
vc++ pack, have alot more options. such
as if file doesnt exist dont create,
append, trunc and so on. But the gnu
compiler, g++'s fstream only allows in
and out, and no file checking. has any
one heard of header that i could use
that would better suit my needs.
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7/24/2001 12:54:52 AM:Bipin Patel
Can you help me with me program.
This what I want to do. I am writing a
program in Visual C . This is all
about I/O file. I want to search into
directory in any drive for string. The
string will be inserted by user on
dialog editbox 4 to 5 strings (ie.
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7/24/2001 1:24:11 AM:Bipin Patel
continue....(ie. "ACY","00:17:26","sa")
Something like this. After the string
is found it should display only those
line that contain found string.
because later on I will have to put
that lines block in Access Data base.
If you can't help me with all this
please atleast help me with reading
more than one file at time for string.
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8/10/2001 9:48:45 AM:Homer
Hi
I am writing a program for a school
which will allow the user to input
student details and then append the
records to a student file status.dat,
it will then read the file and display
the contents on screen. I'm using
borland turbo c++........can you please
give me an example of code that will do
this ie create the file and display
contents.........cheers.
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9/23/2001 6:52:51 PM:willow
HI there. I need to read a series of
chars from a file I done know how many
chars are on each line. Some may have
3 others four my problem is I also have
ints in this file that I want to read.
How do I do this
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9/23/2001 6:59:42 PM:willow
The above is kinda hard to understand
let me give an example. I have in my
file, an idnum 123, an amount 3 and a
code rts, so my file looks like this.
123 3 RTS. The next line in my file may
look like this. 142 4 GLDA and the
next, 456 1 P. how do I read from such
a file not knowing if the character
section has 1, 2, or 3 characters?
I
want to read them individualy.
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2/5/2002 10:26:44 AM:zoran
It is not <fstream>, it is <fstream.h>
file that you need to include at the
top. Apart from that, the code is cool
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2/5/2002 10:44:42 AM:*LuckY*
It depends on your compiler. I compiled
with borland. In visual c++ you have to
use
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4/15/2002 9:24:16 PM:☻☺KDDFLX☺☻
This all sounds great and all, but
unfortunatly for me, i don't use
Borland(not that its bad or anything.),
I use DJGPP/gcc. It seems that it
doesnt have fstream.h. is there a clone
of that or something i can use?BTW,
this is pretty good
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4/22/2002 6:34:54 AM:question
Hi...I'm beginner...I'm doing my
assignment about wild card, and it
needs to open a file. Do you know how
to take information from for example
data.txt and put it into an array. So
in the data.txt there are information
such cat dog fly elephent and after
opening the data.txt the array will
contain the info array[1]=cat
ect...Thank YOuuuuuuu....=p
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4/23/2002 11:39:26 AM:Keith
How would I save and load a double
linked list to my program
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6/20/2002 2:37:21 PM:cjr
hey can you email me and tell how all
of this works
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