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[MC felon]

hi.
i have started on my first big project. i'm a newbee, no doubt... when
i compare the things i make with the things you people program. But
anyway, i'm attempting to re-make notepad (of windows XP). It wont be
as good, of course. But what i'll make is a tiny program that can store
blocks of text in one string and then save this string to disk. my
problem is that i'm not able to take input for my specifications. ex:
'i love programs' must be stored as 'i', '\0', 'l', 'o', 'v', 'e',
'\0', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 's', '\r' (you may observe
that rather distinct '\r' after the whole string.... I want that as a
sign of saying....
"that's the end of the string" just like '\0' does in ordinary strings.
only difference here is that i want to store sentences in a string
rather than words.)

i have, of course, tried my hand at it.... and this is what i cooked-

char g;
for(int p = 0;p<1000;p++)
{
while((g = getche()) != '\r')
{ str[p] = g;}
if(g = '\r') { break; }
}

as you may have guessed, it DOESNT WORK!
please help me out.

[osmium]

"MC felon" wrote:

i have started on my first big project. i'm a newbee, no doubt... when
i compare the things i make with the things you people program. But
anyway, i'm attempting to re-make notepad (of windows XP). It wont be
as good, of course. But what i'll make is a tiny program that can store
blocks of text in one string and then save this string to disk. my
problem is that i'm not able to take input for my specifications. ex:
'i love programs' must be stored as 'i', '\0', 'l', 'o', 'v', 'e',
'\0', 'p', 'r', 'o', 'g', 'r', 'a', 'm', 's', '\r' (you may observe
that rather distinct '\r' after the whole string.... I want that as a
sign of saying....
"that's the end of the string" just like '\0' does in ordinary strings.
only difference here is that i want to store sentences in a string
rather than words.)

i have, of course, tried my hand at it.... and this is what i cooked-

char g;
for(int p = 0;p<1000;p++)
{
while((g = getche()) != '\r')
{ str[p] = g;}
if(g = '\r') { break; }

Did you mean == instead of = ?

}

as you may have guessed, it DOESNT WORK!
please help me out.

[mlimber]

osmium wrote:

"MC felon" wrote:

if(g = '\r') { break; }

Did you mean == instead of = ?

A good habit to get into to prevent this sort of thing (besides putting
your compiler on the highest warning level and using a lint-like
program to watch for this sort of thing) is to put constants first:

if( '\r' = g ) // Compile error! Should be ==

Cheers! --M

[MC felon]

mlimber wrote:

osmium wrote:

"MC felon" wrote:

if(g = '\r') { break; }

Did you mean == instead of = ?

A good habit to get into to prevent this sort of thing (besides putting
your compiler on the highest warning level and using a lint-like
program to watch for this sort of thing) is to put constants first:

if( '\r' = g ) // Compile error! Should be ==

Cheers! --M

Thanks a lot!
so do you think it will work? and how do i assign '\r' to a char and
then attach it to the string (to signify the EOL (end of line)) ??

[David Harmon]

On 8 Dec 2006 08:12:48 -0800 in comp.lang.c++, "MC felon"
<pa******@gmail.comwrote,

>so do you think it will work? and how do i assign '\r' to a char and
then attach it to the string (to signify the EOL (end of line)) ??

I think you will have a happier time of it if you follow common c++
practices more closely. Use std::string for all your ordinary string
manipulation purposes, do not roll your own out of naked char arrays.
Use '\n' for EOL.
Read _Accelerated C++_ by Koenig & Moo, it is a good introduction to the
kind of code you are writing at this point.

[BobR]

MC felon wrote in message
<11**********************@n67g2000cwd.googlegroups .com>...

>
mlimber wrote:

>osmium wrote:

"MC felon" wrote:
if(g = '\r') { break; }

Did you mean == instead of = ?

A good habit to get into to prevent this sort of thing (besides putting
your compiler on the highest warning level and using a lint-like
program to watch for this sort of thing) is to put constants first:

if( '\r' = g ) // Compile error! Should be ==

Cheers! --M

>Thanks a lot!
so do you think it will work? and how do i assign '\r' to a char and
then attach it to the string (to signify the EOL (end of line)) ??

If you are using std::string:

myString.push_back( '\r' );

myString.at( 12 ) = '\r';

--
Bob R
POVrookie

[MC felon]

If you are using std::string:

myString.push_back( '\r' );

myString.at( 12 ) = '\r';

--
Bob R
POVrookie

But what does member function 'push_back' mean?
i can see myString is an object, but where's my string 'str'?
what does the member function at(int somevar) do?
thanks for the new updates!

[BobR]

MC felon wrote in message ...

>

>If you are using std::string:
myString.push_back( '\r' );
myString.at( 12 ) = '\r';

But what does member function 'push_back' mean?
i can see myString is an object, but where's my string 'str'?
what does the member function at(int somevar) do?
thanks for the new updates!

Try this:

#include <iostream>
#include <ostream>
#include <string>

{ // main() or function
std::string str("Jello "):
std::cout<<str<<std::endl;
str.push_back( 'W' ); // add to string
std::cout<<str<<std::endl;
str.push_back( 'o' );
str.push_back( 'r' );
str.push_back( 'l' );
str.push_back( 'd' );
std::cout<<str<<std::endl;
str.at( 0 ) = 'H'; // change string
std::cout<<str<<std::endl;
str += "! Have a nice day.";
std::cout<<str<<std::endl;
return 0;
}

The '.at()' will throw an exception ('out_of_range') if you try an non-valid
index.

--
Bob R
POVrookie

[MC felon]

Try this:

#include <iostream>
#include <ostream>
#include <string>

{ // main() or function
std::string str("Jello "):
std::cout<<str<<std::endl;
str.push_back( 'W' ); // add to string
std::cout<<str<<std::endl;
str.push_back( 'o' );
str.push_back( 'r' );
str.push_back( 'l' );
str.push_back( 'd' );
std::cout<<str<<std::endl;
str.at( 0 ) = 'H'; // change string
std::cout<<str<<std::endl;
str += "! Have a nice day.";
std::cout<<str<<std::endl;
return 0;
}

The '.at()' will throw an exception ('out_of_range') if you try an non-valid
index.

--
Bob R
POVrookie

Awesome! all these are contained in the Gnu, i suppose! thanks a bunch.
by the way, how do i learn more and more functions of the gnu? i'm
learning programming all by myself.

[Juha-Matti Valjus]

MC felon kirjoitti:

how do i learn more and more functions of the gnu? i'm
learning programming all by myself.

You should go and borrow a book of c++ from your local library or visit
http://www.cplusplus.com/doc/tutorial/ for online tutorial.

[Juha-Matti Valjus]

MC felon kirjoitti:

how do i learn more and more functions of the gnu? i'm
learning programming all by myself.

You should go and borrow a book of c++ from your local library or visit
http://www.cplusplus.com/doc/tutorial/ for online tutorial.

[mlimber]

On Dec 9, 4:54 am, "MC felon" <[e-mail]:

all these [std functions] are contained in the Gnu, i suppose! thanks a bunch.

Yes, because GNU supports standard C++ (reasonably well, anyway). There
are also many other platforms on which that same code will work
identically -- that's the beauty of standardized language.

by the way, how do i learn more and more functions of the gnu? i'm
learning programming all by myself.

Get a good book or three (cf.
http://www.parashift.com/c++-faq-lit...html#faq-28.4).
I'd suggest you pick up _Accelerated C++_ by Koenig and Moo. IMHO, it
is the best book for learning to program C++ the right way from the
ground up.

Cheers! --M

[BobR]

mlimber wrote in message ...

>On Dec 9, 4:54 am, "MC felon" <[e-mail]:

>all these [std functions] are contained in the Gnu, i suppose! thanks a

bunch.

>
Yes, because GNU supports standard C++ (reasonably well, anyway). There
are also many other platforms on which that same code will work
identically -- that's the beauty of standardized language.

>by the way, how do i learn more and more functions of the gnu? i'm
learning programming all by myself.

Get a good book or three (cf.
http://www.parashift.com/c++-faq-lit...html#faq-28.4).
I'd suggest you pick up _Accelerated C++_ by Koenig and Moo. IMHO, it
is the best book for learning to program C++ the right way from the
ground up.

Cheers! --M

Add:
And while you are waiting for the postman to deliver that (a/some) book, try
this:

Get "Thinking in C++", 2nd ed. Volume 1&2 by Bruce Eckel
(available for free here. You can buy it in hardcopy too.):
http://www.mindview.net/Books/TICPP/...ngInCPP2e.html
[ Vol. 2 has a whole section on std C++ library. ]
Alf P. Steinbach's "Pointers" document:
http://home.no.net/dubjai/win32cpptu...ters/ch_01.pdf

--
Bob R
POVrookie

[MC felon]

THANKS! i always wanted a book/documentary on pointers! and thanks for
all!

[Wayne Marsh]

MC felon wrote:

Awesome! all these are contained in the Gnu, i suppose! thanks a bunch.
by the way, how do i learn more and more functions of the gnu? i'm
learning programming all by myself.

None of this has anything to do with GNU.