This example attempts to show use of the parallel for construct. However it will

Question

This example attempts to show use of the parallel for construct. However it will generate errors at compile time. Try to determine what is causing the error.

#include <omp.h>

#include <stdio.h>

#include <stdlib.h>

#define N 10

#define CHUNKSIZE 2

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

{

int i, chunk, tid;

float a[N], b[N], c[N];

/* Some initializations */

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

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

chunk = CHUNKSIZE;

#pragma omp parallel for

shared(a,b,c,chunk)

private(i)

schedule(static,chunk)

{

tid = omp_get_threads_num();

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

{

c[i] = a[i] + b[i];

printf("tid= %d i= %d c[i]= %f ", tid, i, c[i]);

}

} /* end of parallel for construct */

}

#include #include #include #define N #de fine CHUNKS I ZE 10 2 int main (int argc, char argv[]) int i, chunk, tid; float a [N], b[N], c[N]; /*Some initializations / for (iF0 i

Explanation / Answer

#include<omp.h>

#include<stdio.h>

#include<stdlib.h>

#define CHUNKSIZE 10

#defibe N 100

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

{

Int nthreads, tid, i, chunk;

float a[N], b[n], c[N];

/*some intializations */

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

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

chunk = CHUNKSIZE;

#pragma omp parallel

shared(a, b, c, nthreads, chunk)

Private(i, tid )

{

tid = omp_get_thread_num() ;

if ( tid==0)

{

nthreads = omp _get_num_threads() ;

printf(" number of threads = %d ", nthreads) ;

}

printf("thread %don't starting... ", tid) ;

#pragma omp for schedule( dynamic, chunk)

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

{

c[i] = a[i] + b[i] ;

Printf("thread %d: c[%d] = %f ", tid, i, c[i]) ;

}

} /* end of parallel section*/

}

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