dev-cpp-users Mailing List for Dev-C++

Replace 'system("pause");' with 'std::cin.get();', and see what happens!

Have a good one, but if your are going to have more than one, give me a 
call ;)

s2...@st... wrote:

>On Mon, 1 Dec 2003, Theodore Kypraios wrote:
>
>  
>
>>When I am running it (ctrl + F10) , the dos-window disappears. (I
>>have -system("pause") before return 0;) .
>>
>>    
>>
>
>Can it be that system() fails? It simply finds a shell (cmd.exe) and
>executes in it the command you wrote: in WinXP "pause" is defined, but
>something can ever go wrong. Try an input, std::cin << a char if you're
>using C++, instead of using system, that's less portable (maybe that not
>all shells support that command).
>
>You say in debug it works: how? Simply starting debug with no breakpoints
>it stops for you to press a key? If so try redirecting output to a file to
>see what normal execution printed out, this can give you more hints.
>
>Hope I helped, bye.
>
>Ferdinando
>
>
>
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Jo,

That seemed to do it, the strange thing is that I am not including winnt.h?

Gracias!

Joe

-----Original Message-----
From: jo mateix [mailto:non...@ho...]
Sent: Wednesday, November 26, 2003 3:08 PM
To: dev...@li...
Subject: Re: [Dev-C++] enum problem???


Hello
I think I've found the problem: One of your Choices' enums is a macro. I've 
found DELETE defined at winnt.h. I don't know what it is used for, or how it

is included, but if you delete DELETE, or rename it,  your program compiles.
bye


>
>I'm experience an error that I am completely unfamiliar with.  If someone
>can help me, please do so.  I've listed the error lines and the compile log
>directly below...and for the really brave, I've placed the whole program at
>the bottom.
>
>Line 19:	enum Choices { TEXTFILE = 1, UPDATE, NEW, DELETE, END };
>...

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I use this code:

include <stdio.h>

int main(void) {
         // Do something useful here.

         int c;
         c = getchar();
         return 0;
}

At 03:24 01-12-03, Theodore Kypraios wrote:
>Hello everyone,
>
>I am facing the following problem.
>
>I have a code. When I am compiling (ctrl + F9) the code I get no errors.
>
>When I am running it (ctrl + F10) , the dos-window disappears. (I
>have -system("pause") before return 0;) .
>
>When I am debugging the code (F8), then everything is OK and I get the
>results ( I store the results to a file).
>
>Any ideas why this is happening.? Hope, I described the problem clearly.
>
>Thanks in advace,
>
>THeo.
>
>ps. WinXP Home Edit. user
>
>Theodore Kypraios, PhD Student
>Department of Mathematics and Statistics, Lancaster University
>================================================
>Web:  http://www.maths.lancs.ac.uk/~kypraios
>email: t.k...@la...
>
>Department of Mathematics and Statistics
>Fylde College
>Lancaster University
>Lancaster, LA1 4YF
>UK
>Tel:+(44)(0)1524 593443
>Fax:+(44)(0)1524 592681
>================================================
>
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: SF.net Giveback Program.
>Does SourceForge.net help you be more productive?  Does it
>help you create better code?  SHARE THE LOVE, and help us help
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>Dev-cpp-users mailing list
>Dev...@li...
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>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

On Mon, 1 Dec 2003, Theodore Kypraios wrote:

> When I am running it (ctrl + F10) , the dos-window disappears. (I
> have -system("pause") before return 0;) .
>

Can it be that system() fails? It simply finds a shell (cmd.exe) and
executes in it the command you wrote: in WinXP "pause" is defined, but
something can ever go wrong. Try an input, std::cin << a char if you're
using C++, instead of using system, that's less portable (maybe that not
all shells support that command).

You say in debug it works: how? Simply starting debug with no breakpoints
it stops for you to press a key? If so try redirecting output to a file to
see what normal execution printed out, this can give you more hints.

Hope I helped, bye.

Ferdinando

It is a normal test-and-set operation.

It checks if the lock is busy or not.
If the lock was busy, it fails.
If the lock wasn't busy, it sets the lock and succeeds.

As you can see, it performs an exchange operation where it copies the
value SEMPAPHORE_C_SET to the lock, while retrieving the previous value.

If the previous value was SEMAPHORE_C_SET, the lock stays set and this
task fails.
If the previous value wasn't SEMAPHORE_C_SET, the lock will not be set and
this task has ok to perform operations on whatever critical resources the
lock is used to protect.

Most OS have functions with this or similar functionality.

/Per W

On Mon, 1 Dec 2003, Smitha V. Babu wrote:

> hi to all..
> Does anyone knows what this piece of code means...
>
> #define sys_test_and_set(lock)    \
> ({                                      \
>    volatile long temp = SEMAPHORE_C_SET;  \
>    __asm__("xchgl %0,(%2)"              \
>            :"=s" (temp)                 \
>            :"0" (temp),"r" (lock));     \
>    temp;                                \
> })
>
>
> thanking in advance
> regards
> smitha
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>
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>

Hello everyone,

I am facing the following problem.

I have a code. When I am compiling (ctrl + F9) the code I get no errors.

When I am running it (ctrl + F10) , the dos-window disappears. (I
have -system("pause") before return 0;) .

When I am debugging the code (F8), then everything is OK and I get the
results ( I store the results to a file).

Any ideas why this is happening.? Hope, I described the problem clearly.

Thanks in advace,

THeo.

ps. WinXP Home Edit. user

Theodore Kypraios, PhD Student
Department of Mathematics and Statistics, Lancaster University
================================================
Web:  http://www.maths.lancs.ac.uk/~kypraios
email: t.k...@la...

Department of Mathematics and Statistics
Fylde College
Lancaster University
Lancaster, LA1 4YF
UK
Tel:+(44)(0)1524 593443
Fax:+(44)(0)1524 592681
================================================

hi to all..
Does anyone knows what this piece of code means...

#define sys_test_and_set(lock)    \
({                                      \
   volatile long temp = SEMAPHORE_C_SET;  \
   __asm__("xchgl %0,(%2)"              \
           :"=s" (temp)                 \
           :"0" (temp),"r" (lock));     \
   temp;                                \
})


thanking in advance
regards
smitha
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