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Homework and Emergencies Homework & Coursework Questions Calling compiled C program with Perl program Post 302498504 by Corona688 on Monday 21st of February 2011 02:42:23 PM
Old 02-21-2011
  1. RAND_MAX does not work that way. RAND_MAX is something the compiler tells you -- the highest possible number the random number generator will ever give you. Usually, to generate numbers between 0-9, you'd do (rand()%10), and for numbers 1-10, (rand()%10)+1.
  2. This isn't DOS, you can't just run programs that happen to be in the current directory and expect them to be found. You have to tell it it's in the current directory by telling it ./myprog , not just myprog
  3. There's no point running system() on things you put in backticks. Do one, or the other: $code=system("./myprog"); $stuff=`./myprog`;
  4. system() doesn't return the program's text, it returns the program's return code (usually zero). If you want it's output, that's what backticks are for. $stuff=`./myprogram`;
  5. Perl almost certainly has the ability to generate random numbers without calling a C program. In fact perl has a rand() too (try perldoc -f rand) which seems more convenient. You can just do $stuff=int(rand(10))+1; to get numbers 1-10. Modern versions of perl also call srand by themselves when run, so you get a different random starting point every time without any effort on your part.
 

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OPEN(1) 							     Linux 1.x								   OPEN(1)

NAME
open - start a program on a new virtual terminal (VT). SYNOPSIS
open [-c vtnumber] [-s] [-u] [-l] [-v] [--] command command_options DESCRIPTION
open will find the first available VT, and run on it the given command with the given command options, standard input, output and error are directed to that terminal. The current search path ($PATH) is used to find the requested command. If no command is specified then the envi- ronment variable $SHELL is used. OPTIONS -c vtnumber Use the given VT number and not the first available. Note you must have write access to the supplied VT for this to work. -s Switch to the new VT when starting the command. The VT of the new command will be made the new current VT. -u Figure out the owner of the current VT, and run login as that user. Suitable to be called by init. Shouldn't be used with -c or -l. -l Make the command a login shell. A - is prepended to the name of the command to be executed. -v Be a bit more verbose. -w wait for command to complete. If -w and -s are used together then open will switch back to the controlling terminal when the command completes. -- end of options to open. NOTE
If open is compiled with a POSIX (Gnu) getopt() and you wish to set options to the command to be run, then you must supply the end of options -- flag before the command. EXAMPLES
open can be used to start a shell on the next free VT, by using the command: open bash To start the shell as a login shell, use: open -l bash To get a long listing you must supply the -- separator: open -- ls -l SEE ALSO
login(1), doshell(8), switchto(1). AUTHOR
Jon Tombs <jon@gtex02.us.es or jon@robots.ox.ac.uk> -w idea from "sam". 19 Jul 1996 V1.4 OPEN(1)
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