Re: (part 4) Han from China answers your C questions,

[snips]

On Thu, 30 Oct 2008 15:46:04 +0100, George Orwell wrote:

Why is it wrong??(About n!)
upyzl said:
I want to calculate n!,and my C code is as follows:

This is off-topic for this newsgroup. ISO C makes no assurances that
your target processor (if there is a processor) can calculate n! in a
reasonable length of time. It's best not to make any assumptions.

ISO C makes no assurances that the simplest "Hello, world" program will
ever actually produce an output and terminate; the system's I/O buffers
could wind up in a locked state and never allow the output.

If the lack of performance guarantees is a reason not to calculate n!, it
is also reason not to do *any* coding in C. Nor C++, Perl, Haskell or
any other language.

system("pause");

Not every system has a 'pause' command. To increase the portability of
your program /somewhat/, perhaps add pause() after your system() call so
that on systems with the typical pause() function, you can send your
program a signal to resume. Actually, you may want to investigate
possible flow-control mechanisms.

Why not simply use puts( "Press enter to continue" ); getchar(); ?

experience, I recommend building up a little command string and then
calling system(). Something like this:

snprintf(command, sizeof command, "factorial %lu", n);
system(command);

What this has to do with C, however...

.