C++ code example on the FASRC cluster. arrays_and_pointers.cpp illustrates arrays and pointers.
arrays_and_pointers.cpp: c++ source coderunscript.sh: batch-job submission script
/*
Program: arrays_and_pointers.cpp
Arrays and pointers in C++
*/
#include <iostream>
#include <iomanip>
#include <stdlib.h>
using namespace std;
#define XTAB '\t'
#define YTAB '\v'
// Main program.............................................
int main(){
int i;
int n = 10;
double arr_1d[n];
double *p_1d;
p_1d = arr_1d;
for( i = 0; i < n; i++ ){
*( p_1d + i ) = ( double )rand() / RAND_MAX;
}
// Results................................................
cout << YTAB;
cout << " Vector: " << endl;
for( i = 0; i < n; i++ ){
cout << setw(4) << i << setw(10) << setprecision(5)
<< arr_1d[i] << endl;
}
return 0;
}#!/bin/bash
#SBATCH -J arrays_and_pointers # job name
#SBATCH -o arrays_and_pointers.out # standard output file
#SBATCH -e arrays_and_pointers.err # standard error file
#SBATCH -p serial_requeue # partition
#SBATCH -c 1 # number of cores
#SBATCH -t 0-00:30 # time in D-HH:MM
#SBATCH --mem=4000 # total memory
# load required modules
# (these must be the same modules that were used for compiling)
module load gcc
# run code
./arrays_and_pointers.xWe recommend compiling on a compute node. Request an interactive job to use a compute node, e.g.,
salloc --partition test --time 00:30:00 -c 2 --mem-per-cpu 2G- Intel compilers, e.g.,
module load intel
icpc -O2 -o arrays_and_pointers.x arrays_and_pointers.cpp # for intel version < 23.2, use `icpc`
icpx -O2 -o arrays_and_pointers.x arrays_and_pointers.cpp # for intel version >= 23.2, use `icpx`.- GNU compilers, e.g.,
module load gcc
g++ -O2 -o arrays_and_pointers.x arrays_and_pointers.cppSubmit job
sbatch runscript.shExample output:
Vector:
0 0.84019
1 0.39438
2 0.7831
3 0.79844
4 0.91165
5 0.19755
6 0.33522
7 0.76823
8 0.27777
9 0.55397