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/******************************************************************************

* FILE: omp_reduction.c

* DESCRIPTION:

*   OpenMP Example - Combined Parallel Loop Reduction - C/C++ Version

*   This example demonstrates a sum reduction within a combined parallel loop

*   construct.  Notice that default data element scoping is assumed - there

*   are no clauses specifying shared or private variables.  OpenMP will

*   automatically make loop index variables private within team threads, and

*   global variables shared.

* AUTHOR: Blaise Barney  5/99

* LAST REVISED: 04/06/05

******************************************************************************/

#include <omp.h>

#include <stdio.h>

#include <stdlib.h>

int main (int argc, char *argv[]) {

int   i, n;

float a[100], b[100], sum;

/* Some initializations */

n = 100;

for (i=0; i < n; i++)

  a[i] = b[i] = i * 1.0;

sum = 0.0;

#pragma omp parallel for reduction(+:sum)

  for (i=0; i < n; i++)

    sum = sum + (a[i] * b[i]);

printf("   Sum = %f\n",sum);

  return 0;

}