printf ultra-fast question

[Martin Jørgensen]

Hi,

Perhaps a stupid question but I wonder if this isn't possible using C:

printf("\nOr push <enter> for default (which is theta=%ld)%s", theta, ": ");
It would be nicer to have it on one line... (I know this works):

printf("\nOr push <enter> for default (which is theta=%ld)", theta);
printf(": ");*/
Compiler: MS Visual studio 2005. The compiler doesn't complain actually
(well, at least not about the particular line). But when I run the
program VS2005 opens a window named "Visual Studio Just-In-Time
Debugger" and then it wants me to choose between two possible debuggers
(1: New instance of VS 2005, 2: My project). I then tell it that I don't
want to debug the program just stops. If I instead tell it that I want
to debug it, it says: "Unhandled exception at 0x10227.... (msvcr80d.dll)
Access violation reading...

What is wrong?
Med venlig hilsen / Best regards
Martin Jørgensen

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[August Karlstrom]

Martin Jørgensen wrote:

Perhaps a stupid question but I wonder if this isn't possible using C:

printf("\nOr push <enter> for default (which is theta=%ld)%s", theta, ":
");
It would be nicer to have it on one line... (I know this works):

printf("\nOr push <enter> for default (which is theta=%ld)", theta);
printf(": ");*/
Compiler: MS Visual studio 2005. The compiler doesn't complain actually
(well, at least not about the particular line). But when I run the
program VS2005 opens a window named "Visual Studio Just-In-Time
Debugger" and then it wants me to choose between two possible debuggers
(1: New instance of VS 2005, 2: My project). I then tell it that I don't
want to debug the program just stops. If I instead tell it that I want
to debug it, it says: "Unhandled exception at 0x10227.... (msvcr80d.dll)
Access violation reading...

What is wrong?

If I remember correctly you can just write the strings one after the
other like

"first string" "second string"

The compiler will turn it into a single string constant.
August

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[tmp123]

Martin Jørgensen wrote:

Hi,

Perhaps a stupid question but I wonder if this isn't possible using C:

printf("\nOr push <enter> for default (which is theta=%ld)%s", theta, ": ");
It would be nicer to have it on one line... (I know this works):

printf("\nOr push <enter> for default (which is theta=%ld)", theta);
printf(": ");*/

Check type of "theta"?

[Keith Thompson]

Martin Jørgensen <un*********@spam.jay.net> writes:

Perhaps a stupid question but I wonder if this isn't possible using C:

printf("\nOr push <enter> for default (which is theta=%ld)%s", theta, ": ");
It would be nicer to have it on one line... (I know this works):

printf("\nOr push <enter> for default (which is theta=%ld)", theta);
printf(": ");*/
Compiler: MS Visual studio 2005. The compiler doesn't complain
actually (well, at least not about the particular line). But when I
run the program VS2005 opens a window named "Visual Studio
Just-In-Time Debugger" and then it wants me to choose between two
possible debuggers (1: New instance of VS 2005, 2: My project). I then
tell it that I don't want to debug the program just stops. If I
instead tell it that I want to debug it, it says: "Unhandled exception
at 0x10227.... (msvcr80d.dll) Access violation reading...

What is wrong?

What's wrong is that you're not giving us enough information. Post a
small complete compilable program that exhibits the problem.

Your first printf() statement should be equivalent to:

printf("\nOr push <enter> for default (which is theta=%ld): ", theta);

That should be ok *if* theta is of type (signed) long (though the
output might not appear immediately unless the printf() is follwwed by
fflush(stdout)).

Why are you putting the ": " in a separate argument? Since "%s" and
": " are both 2 characters long, it doesn't even save you any space in
your source.

--
Keith Thompson (The_Other_Keith) ks***@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.

[Ben Pfaff]

Martin Jxrgensen <un*********@spam.jay.net> writes:

Perhaps a stupid question but I wonder if this isn't possible using C:

printf("\nOr push <enter> for default (which is theta=%ld)%s", theta, ": ");

That's a strange invocation of printf(). I would write it like
this:
printf("\nOr push <enter> for default (which is theta=%ld): ", theta);

Also, as another poster commented, check that `theta' is really a
long int.
--
"I ran it on my DeathStation 9000 and demons flew out of my nose." --Kaz

[Martin Jørgensen]

Ben Pfaff wrote:

Martin Jxrgensen <un*********@spam.jay.net> writes:

Perhaps a stupid question but I wonder if this isn't possible using C:

printf("\nOr push <enter> for default (which is theta=%ld)%s", theta, ": ");

That's a strange invocation of printf(). I would write it like
this:
printf("\nOr push <enter> for default (which is theta=%ld): ", theta);

Also, as another poster commented, check that `theta' is really a
long int.

Aah, stupid mistake. theta was double, so the following works:

printf("\nOr push <enter> for default (which is theta=%g)%s", theta, ": ");

That explains the strange behaviour from vs2005... Thanks everyone.
Med venlig hilsen / Best regards
Martin Jørgensen

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[Keith Thompson]

Martin Jørgensen <un*********@spam.jay.net> writes:

Ben Pfaff wrote:

[...]

Also, as another poster commented, check that `theta' is really a
long int.

Aah, stupid mistake. theta was double, so the following works:

printf("\nOr push <enter> for default (which is theta=%g)%s", theta, ": ");

That explains the strange behaviour from vs2005... Thanks everyone.

Great -- but it still doesn't explain why you pass the ": " as a
separate argument, rather than the simpler:

printf("\nOr push <enter> for default (which is theta=%g): ", theta);

My guess is that it's a random change you made while trying to track
down the problem. Now would be a good time to back it out.

--
Keith Thompson (The_Other_Keith) ks***@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.

[Martin Jørgensen]

Keith Thompson wrote:
-snip-

Great -- but it still doesn't explain why you pass the ": " as a
separate argument, rather than the simpler:

printf("\nOr push <enter> for default (which is theta=%g): ", theta);

My guess is that it's a random change you made while trying to track
down the problem. Now would be a good time to back it out.

Ah, I see... Actually I think I did it that way because that is how I
did some matlab programs for some months ago... Don't know if matlab
understands printf("\nOr push <enter> for default (which is theta=%g):
", theta);, but perhaps you're right...

Yeah, you're right. I should change the line... I'll do that tomorrow.
Gotta get some sleep now. It must be a bad habit or something, but the
important thing is that both methods work :-)
Med venlig hilsen / Best regards
Martin Jørgensen

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