Redirecting input from file

[dmoran21@cox.net]

Re: Redirecting input from file

On Jul 3, 2:12 pm, "Army1987" <please....@for .itwrote:

<dmora...@cox.n etha scritto nel messaggionews:1 183473735.07644 0.202070@k29g20 00hsd.googlegro ups.com...
[snip code which casts the result of malloc]I also tried to remove the casts and it didn't run.
>
Are you compiling it with a C++ compiler?
(If so, I'd be surprised of knowing free() works even without
casting the argument to void*).

I am compiling with gcc on Linux. As for the results of the runs, my
boss ran the program that I wrote and the output looks like it's OK. I
will admit that I've not dealt with arrays since I took a class in C
in 2004. I still have my notes and books from that class and just did
it the way the book and notes told me. The notes are also online at
cs1313.ou.edu if you want to check them out.

Dave

[Keith Thompson]

Re: Redirecting input from file

"dmoran21@cox.n et" <dmoran21@cox.n etwrites:

On Jul 3, 2:12 pm, "Army1987" <please....@for .itwrote:

><dmora...@cox. netha scritto nel
>messaggionews: 1183473735.0764 40.202070@k29g2 000hsd.googlegr oups.com...
>[snip code which casts the result of malloc]

I also tried to remove the casts and it didn't run.

>>
>Are you compiling it with a C++ compiler?
>(If so, I'd be surprised of knowing free() works even without
>casting the argument to void*).

>
I am compiling with gcc on Linux. As for the results of the runs, my
boss ran the program that I wrote and the output looks like it's OK. I
will admit that I've not dealt with arrays since I took a class in C
in 2004. I still have my notes and books from that class and just did
it the way the book and notes told me. The notes are also online at
cs1313.ou.edu if you want to check them out.

If you have code that casts the result of malloc, and removing the
cast causes it to fail, the most likely explanation is that you've
forgetten the required '#include <stdlib.h>'.

Telling us that "it didn't run" doesn't help anybody. You keep
telling us things that make it clear that there are problems in your
code, but you don't post the actual code so we can help you fix them.

You can post your actual current code and let us help you with it, or
you can keep it to yourself and rest secure in the knowledge that your
code will continue to work until it breaks at the most inconvenient
possible moment. It's your choice.

--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[dmoran21@cox.net]

Re: Redirecting input from file

On Jul 3, 7:22 pm, Keith Thompson <k...@mib.orgwr ote:

"dmora...@cox.n et" <dmora...@cox.n etwrites:

On Jul 3, 2:12 pm, "Army1987" <please....@for .itwrote:

<dmora...@cox.n etha scritto nel
messaggionews:1 183473735.07644 0.202070@k29g20 00hsd.googlegro ups.com...
[snip code which casts the result of malloc]

I also tried to remove the casts and it didn't run.

>

Are you compiling it with a C++ compiler?
(If so, I'd be surprised of knowing free() works even without
casting the argument to void*).

>

I am compiling with gcc on Linux. As for the results of the runs, my
boss ran the program that I wrote and the output looks like it's OK. I
will admit that I've not dealt with arrays since I took a class in C
in 2004. I still have my notes and books from that class and just did
it the way the book and notes told me. The notes are also online at
cs1313.ou.edu if you want to check them out.

>
If you have code that casts the result of malloc, and removing the
cast causes it to fail, the most likely explanation is that you've
forgetten the required '#include <stdlib.h>'.
>
Telling us that "it didn't run" doesn't help anybody. You keep
telling us things that make it clear that there are problems in your
code, but you don't post the actual code so we can help you fix them.
>
You can post your actual current code and let us help you with it, or
you can keep it to yourself and rest secure in the knowledge that your
code will continue to work until it breaks at the most inconvenient
possible moment. It's your choice.
>
--
Keith Thompson (The_Other_Keit h) k...@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

I will post the code when I have it up at work...I can't get to it at
home.

Dave

[Ben Bacarisse]

Re: Redirecting input from file

"dmoran21@cox.n et" <dmoran21@cox.n etwrites:
<snip>

I still have my notes and books from that class and just did
it the way the book and notes told me. The notes are also online at
cs1313.ou.edu if you want to check them out.

A rather depressing density of errors. OK, it is a course for non CS
students but even so... I was going to pick out some of my favourite
howlers but, after a little thought, that seems rather cruel.

--
Ben.

[dmoran21@cox.net]

Re: Redirecting input from file

On Jul 3, 7:43 pm, Ben Bacarisse <ben.use...@bsb .me.ukwrote:

"dmora...@cox.n et" <dmora...@cox.n etwrites:
>
<snip>
>

I still have my notes and books from that class and just did
it the way the book and notes told me. The notes are also online at
cs1313.ou.edu if you want to check them out.

>
A rather depressing density of errors. OK, it is a course for non CS
students but even so... I was going to pick out some of my favourite
howlers but, after a little thought, that seems rather cruel.
>
--
Ben.

When I took the class, it was required to do things a certain way and
that's the way I've always done them because I've only learned that
way. Maybe I need to go buy another book.

Dave

[Barry Schwarz]

Re: Redirecting input from file

On Tue, 03 Jul 2007 06:42:01 -0700, "dmoran21@cox.n et"
<dmoran21@cox.n etwrote:

>On Jul 2, 2:07 pm, "Army1987" <please....@for .itwrote:

Many relevant comments the OP chose to ignore.

><dmora...@cox. netha scritto nel messaggionews:1 183391088.90249 9.192290@n60g20 00hse.googlegro ups.com...I've got one more error that I can't seem to get worked out. I have a

segmentation fault and upon playing with my code, I think that it
crashes when I try to deallocate the "date" array.

snip

#include <math.h>

If your book tells you to include unused headers ...

>>

snip

float* precipvals = (float*)NULL;

and to cast the NULL pointer constant ...

float* precip3hrs = (float*)NULL;

snip

precipvals = (float*)malloc( sizeof(int) * arraylength);

and to cast the return from malloc ...

and that sizeof(int) is enough space for a float ...

>>

snip

>I'm just going by the way I was taught and how my book does it. I'm
>not a professional programmer.

then you very much need to find a better book.



Remove del for email

[dmoran21@cox.net]

Re: Redirecting input from file

then you very much need to find a better book.
>
Remove del for email

I included the math.h header because I originally planned to do some
other calculations, but forgot to take it out when I changed my mind.

Dave

[Richard Heathfield]

Re: Redirecting input from file

Ben Bacarisse said:

"dmoran21@cox.n et" <dmoran21@cox.n etwrites:
<snip>

>I still have my notes and books from that class and just did
>it the way the book and notes told me. The notes are also online at
>cs1313.ou.ed u if you want to check them out.

>
A rather depressing density of errors. OK, it is a course for non CS
students but even so... I was going to pick out some of my favourite
howlers but, after a little thought, that seems rather cruel.

I looked at two of the PDFs (the intro, and the one on variables), and
found little that was actually wrong. Presumably it gets worse later
on.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[Flash Gordon]

Re: Redirecting input from file

dmoran21@cox.ne t wrote, On 04/07/07 02:18:

On Jul 3, 7:43 pm, Ben Bacarisse <ben.use...@bsb .me.ukwrote:

>"dmora...@cox. net" <dmora...@cox.n etwrites:
>>
><snip>
>>

>>I still have my notes and books from that class and just did
>>it the way the book and notes told me. The notes are also online at
>>cs1313.ou.e du if you want to check them out.

>A rather depressing density of errors. OK, it is a course for non CS
>students but even so... I was going to pick out some of my favourite
>howlers but, after a little thought, that seems rather cruel.

>
When I took the class, it was required to do things a certain way and
that's the way I've always done them because I've only learned that
way. Maybe I need to go buy another book.

I've not looked at the notes, but I would recommend K&R2 as a reference
whatever your current book is.
--
Flash Gordon

[Army1987]

Re: Redirecting input from file


"Keith Thompson" <kst-u@mib.orgha scritto nel messaggio news:lnsl8510hr .fsf@nuthaus.mi b.org...

"dmoran21@cox.n et" <dmoran21@cox.n etwrites:

>On Jul 3, 2:12 pm, "Army1987" <please....@for .itwrote:

>><dmora...@cox .netha scritto nel
>>messaggionews :1183473735.076 440.202070@k29g 2000hsd.googleg roups.com...
>>[snip code which casts the result of malloc]

>I also tried to remove the casts and it didn't run.

>>>
>>Are you compiling it with a C++ compiler?
>>(If so, I'd be surprised of knowing free() works even without
>>casting the argument to void*).

>>
>I am compiling with gcc on Linux. As for the results of the runs, my
>boss ran the program that I wrote and the output looks like it's OK. I
>will admit that I've not dealt with arrays since I took a class in C
>in 2004. I still have my notes and books from that class and just did
>it the way the book and notes told me. The notes are also online at
>cs1313.ou.ed u if you want to check them out.

>
If you have code that casts the result of malloc, and removing the
cast causes it to fail, the most likely explanation is that you've
forgetten the required '#include <stdlib.h>'.

He did include it, at least in the code he posted.

[dmoran21@cox.net]

Re: Redirecting input from file

On Jul 4, 1:31 am, Richard Heathfield <r...@see.sig.i nvalidwrote:

Ben Bacarisse said:
>

"dmora...@cox.n et" <dmora...@cox.n etwrites:
<snip>

I still have my notes and books from that class and just did
it the way the book and notes told me. The notes are also online at
cs1313.ou.edu if you want to check them out.

>

A rather depressing density of errors. OK, it is a course for non CS
students but even so... I was going to pick out some of my favourite
howlers but, after a little thought, that seems rather cruel.

>
I looked at two of the PDFs (the intro, and the one on variables), and
found little that was actually wrong. Presumably it gets worse later
on.
>
--
Richard Heathfield <http://www.cpax.org.uk >
Email: -www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

The book I have is called "C: How To Program" by Deitel and Deitel.
Perhaps C isn't the best language to learn for my profession. I am a
professional Mathematician and going back to school to finish my
meteorology degree.

Dave

[Richard Heathfield]

Re: Redirecting input from file

dmoran21@cox.ne t said:

<snip>

The book I have is called "C: How To Program" by Deitel and Deitel.

Well, that's okay. Not perfect, but pretty good.

Perhaps C isn't the best language to learn for my profession.

Oh, C is always the best language to learn, no matter what your
profession. Whether you're a truck driver or a ballroom dancer or a
hypnotherapist or a wheeltapper, C is what you want.

I am a
professional Mathematician and going back to school to finish my
meteorology degree.

Sounds like a job for C and possibly Matlab.

Drop all those silly casts. If that gives you diagnostic messages at
compile time or breaks the behaviour at runtime, *tell us*, and we'll
show you how to fix it. 99.9908237% of the time, casts aren't the right
fix.

Whenever you attempt to acquire a resource (either open a file, or
allocate memory, or whatever it is), check that the attempt succeeded.

I fixed your code along these lines recently. As far as I can tell, you
ignored those fixes. I'm still waiting for evidence of willingness to
learn before I expend more debugging time here.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[dmoran21@cox.net]

Re: Redirecting input from file

On Jul 4, 8:08 am, Richard Heathfield <r...@see.sig.i nvalidwrote:

dmora...@cox.ne t said:
>
<snip>
>

The book I have is called "C: How To Program" by Deitel and Deitel.

>
Well, that's okay. Not perfect, but pretty good.
>

Perhaps C isn't the best language to learn for my profession.

>
Oh, C is always the best language to learn, no matter what your
profession. Whether you're a truck driver or a ballroom dancer or a
hypnotherapist or a wheeltapper, C is what you want.
>

I am a
professional Mathematician and going back to school to finish my
meteorology degree.

>
Sounds like a job for C and possibly Matlab.
>
Drop all those silly casts. If that gives you diagnostic messages at
compile time or breaks the behaviour at runtime, *tell us*, and we'll
show you how to fix it. 99.9908237% of the time, casts aren't the right
fix.
>
Whenever you attempt to acquire a resource (either open a file, or
allocate memory, or whatever it is), check that the attempt succeeded.
>
I fixed your code along these lines recently. As far as I can tell, you
ignored those fixes. I'm still waiting for evidence of willingness to
learn before I expend more debugging time here.
>
--
Richard Heathfield <http://www.cpax.org.uk >
Email: -www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

I got my hands on the error messages that I got (I got into my e-mail
at work, but since I'm not in the office today, I can't get to my
code). I got the following:

Cannot convert 'void*' to 'float*' in function main(int, char * *)

I will post my code tomorrow when I'm in the office.

Dave

[Barry Schwarz]

Re: Redirecting input from file

On Wed, 04 Jul 2007 06:50:40 -0700, "dmoran21@cox.n et"
<dmoran21@cox.n etwrote:

>On Jul 4, 8:08 am, Richard Heathfield <r...@see.sig.i nvalidwrote:

>dmora...@cox.n et said:
>>
><snip>
>>

The book I have is called "C: How To Program" by Deitel and Deitel.

>>
>Well, that's okay. Not perfect, but pretty good.
>>

Perhaps C isn't the best language to learn for my profession.

>>
>Oh, C is always the best language to learn, no matter what your
>profession. Whether you're a truck driver or a ballroom dancer or a
>hypnotherapi st or a wheeltapper, C is what you want.
>>

I am a
professional Mathematician and going back to school to finish my
meteorology degree.

>>
>Sounds like a job for C and possibly Matlab.
>>
>Drop all those silly casts. If that gives you diagnostic messages at
>compile time or breaks the behaviour at runtime, *tell us*, and we'll
>show you how to fix it. 99.9908237% of the time, casts aren't the right
>fix.
>>
>Whenever you attempt to acquire a resource (either open a file, or
>allocate memory, or whatever it is), check that the attempt succeeded.
>>
>I fixed your code along these lines recently. As far as I can tell, you
>ignored those fixes. I'm still waiting for evidence of willingness to
>learn before I expend more debugging time here.
>>
>--
>Richard Heathfield <http://www.cpax.org.uk >
>Email: -www. +rjh@
>Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
>"Usenet is a strange place" - dmr 29 July 1999

>
>I got my hands on the error messages that I got (I got into my e-mail
>at work, but since I'm not in the office today, I can't get to my
>code). I got the following:
>
>Cannot convert 'void*' to 'float*' in function main(int, char * *)

This is a very strong indication that you are using a C++ compiler and
not a C compiler.


Remove del for email

[Richard Heathfield]

Re: Redirecting input from file

dmoran21@cox.ne t said:

<snip>

I got my hands on the error messages that I got (I got into my e-mail
at work, but since I'm not in the office today, I can't get to my
code). I got the following:
>
Cannot convert 'void*' to 'float*' in function main(int, char * *)

Either:

(a) you forgot to #include <stdlib.h>
(b) you're using C++

if (a), include it.
if (b), either

(d) you're using C++ deliberately
(e) you're using C++ accidentally

if (d), ask in comp.lang.c++ rather than comp.lang.c
if (e), you may find that changing your filename suffix from .cpp to .c
is sufficient.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999