[[PageOutline]]
= C Codes =

== Hello World ==
{{{#!C
/* hello.c: display a message on the screen */
 
#include <stdio.h>
 
int main(){
  printf("hello, C world\n");
  return 0;
}

}}}
* Text between /* and */ are comments.
* '''#include <stdio.h>''' to load the header file.
* There are many header files in the standard C library. http://en.wikipedia.org/wiki/C_standard_library
* Program always begins with '''main()''' function.
* '''main()''' returns a integer.

=== Compile with GNU C ===
{{{[tulaneID@cypress1 ~]$ gcc hello.c}}}

=== Compile with Intel C ===
{{{
[tulaneID@cypress1 ~]$ module load intel-psxe
[tulaneID@cypress1 ~]$ icc hello.c
}}}

== Links for Tutorial ==
* [[http://en.wikibooks.org/wiki/C_Programming | wikibooks ]]

== Examples of Jobscript ==

{{{#!sh
#!/bin/bash
#SBATCH --job-name=HelloC 
#SBATCH --qos=normal         
#SBATCH --time=0-00:10:00     ### Wall clock time limit in Days-HH:MM:SS
#SBATCH --nodes=1             ### Node count required for the job
#SBATCH --ntasks-per-node=1   ### Nuber of tasks to be launched per Node

echo Start Job
pwd

cat $SLURM_JOB_NODELIST

./a.out

echo End job
}}}

== Parallel C ==
* [[cypress/Programming/Cexamples/OpenMp|OpenMP examples in C]]
* [[cypress/Programming/Cexamples/Mpi|MPI examples in C]]

== More Examples ==
* [[cypress/Programming/ApproximatePi|Approximate Pi]]
* [[cypress/Programming/HeatMassTransfer|Heat/Mass Transfer]]
* [[cypress/Programming/StokesFlow|Stokes Flow In a Cavity]]
* [[cypress/Programming/ParticleStrengthExchangeMethod|Particle Strength Exchange Method]]