On Wednesday 26 May 2010 18:16:18 Brandon McCaig wrote:
> On Wed, May 26, 2010 at 9:43 AM, Andros Zuna <[email protected]> wrote:
> > But how could I test if the command executes if the return value changes?
> > ...is there a unix command or other way that generates random/different
> > return values??
>
> The following C program will return a pseudo-random value every time it's
> run:
>
> // --BEGIN--
> #include <stdlib.h>
>
> int main(int argc, char * argv[])
> {
> srand(time(0));
>
> return rand() % 256;
> }
>
> // --END--
>
> Save it into a file (i.e., main.c) and compile it with GCC:
>
> gcc main.c -o rand
>
> Then, you can execute the program.
>
> ./rand
>
> Though if you're only concerned with zero and non-zero then there's
> little reason for the range of return values that I've allowed for
> (0-255). You could probably get away with changing...
>
> return rand() % 256;
>
> ...to...
>
> return rand() % 2;
>
> That will probably increase the likelihood of encountering 0.
>
> (Sorry for the C on a Perl mailing list :P)
You can also do the same in Perl using "perldoc -f exit"
# Untested
#!/usr/bin/perl
srand()
exit(rand()%2);
Though you can naturally use false or test for such things too.
Regards,
Shlomi Fish
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