Calling compiled C program with Perl program Post: 302498504

Sponsored Content

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

02-21-2011

Registered User

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.
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
There's no point running system() on things you put in backticks. Do one, or the other: $code=system("./myprog"); $stuff=`./myprog`;
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`;
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.

Corona688

View Public Profile for Corona688

Visit Corona688's homepage!

Find all posts by Corona688

10 More Discussions You Might Find Interesting

1. Programming

Running a compiled Program

Just getting into the Unix command line programming and am unable to run any program I write. I am using a Makefile and the source is compiling but when I enter the name of the output file I get back: bash: lab01exe.out: command not found I'm sure I am just dooing something simple...

2. Programming

How to use a .exe with a compiled program.

I am confused about how to use a .exe file in unix along with a compiled C++ program. I've been using emacs and I compiled with g++, but I have no idea how that relates to use with a .exe.

3. Shell Programming and Scripting

Problem with `cat` the compiled output of C program in unix

Hello All, I have coded a C program which looks something like below... (program name: test.c) #include<stdio.h> main() { int dist,dm,dcm; printf(" Enter the distance between 2 cities in KM : "); scanf("%d",&dist); dm=dist*1000; dcm=dist*10; printf("Distance between 2 cities in...

4. UNIX for Dummies Questions & Answers

Calling a c program using perl script

On bash I run precompiled c Program as follows: ./create_cust 1 10000 US S > us_cust.csv create_cust is a c program and requires 4 parameters. I am redirecting the output of this program to csv file I need to run this same program in perl I am aware of exec command though not...

5. Shell Programming and Scripting

Calling perl script in shell program

How to call a perl script in shell program / shell scripting. PLS HELP ME

6. UNIX for Dummies Questions & Answers

Making a program compiled on Unix (HPUX) work on Linux

I am trying to make an application which works on unix to work on linux. I already tried copying the binary files and start it up but I am getting an error stating "Cannot execute binary file". Then I tried to recompile but i am getting an error whenever I tried to recompile. I am getting the...

7. Solaris

Issue in pro*C program compiled in solaris 10

Hi, We upgraded our servers from solaris 9 to 10. We recompiled all the Pro*C programs with the new oracle version as well. Oracle is 11g. We are facing core dump with the below error for certain executions. But when we are placing new statements between the error fucntion we get junk values to...

8. Programming

Using ANSI color codes in gcc compiled program

I have put some yellow color codes and works well. I call the funstion using print_usage(stderr, 0); I would like to know if there is any way, to store the ansi color codes in variables and then call them inside fprintf. Or have a format followed by the strings I want to output. ...

9. Red Hat

Run program compiled in Ubuntu in centos

Will a program compiled in ubuntu 14.04 execute in Centos 7? That is to say a tarball or zip is downloaded from github and extracted, compiled, and make is all done in ubuntu 14.04, can I mv the program from ubuntu 14.04 to Centos 7, add it to path in Centos 7. And run it? Thank you :)

10. Shell Programming and Scripting

Perl program get a response before the program quits

I created a program, so a kid can practice there math on it. It dispenses varies math problems and the kid must input an answer. I also want it to grade the work they have done, but I can't find the best place for it to print out the grade. I have: if ( $response =~ m/^/ ) { $user_wants_to_quit...

LEARN ABOUT OPENSOLARIS

rand

rand(3UCB)					     SunOS/BSD Compatibility Library Functions						rand(3UCB)

NAME

       rand, srand - simple random number generator

SYNOPSIS

       /usr/ucb/cc [ flag ... ] file ...

       int rand();

       int srand(seed)
       unsigned seed;

DESCRIPTION

       rand()  uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo-random numbers in the range
       from 0 to 2^31 -1.

       srand() can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a
       value of 1.

SEE ALSO

       cc(1B), drand48(3C), rand(3C), random(3C)

NOTES

       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-thread applications is unsupported.

       The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more	elaborate,
       random-number generators.

       The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1.

SunOS 5.11							    30 Oct 2007 							rand(3UCB)

10 More Discussions You Might Find Interesting

1. Programming

Running a compiled Program

Discussion started by: Krebsbac

2. Programming

How to use a .exe with a compiled program.

Discussion started by: adamsy

3. Shell Programming and Scripting

Problem with `cat` the compiled output of C program in unix

Discussion started by: smarty86

4. UNIX for Dummies Questions & Answers

Calling a c program using perl script

Discussion started by: gkbond