Modify and run the program shown below in the following way. There is an array of 20 elements defined in the program. The elements of the array are:

[20 18 16 14 12 10 8 6 4 2 -10 -20 -30 -40 15 23 25 75 45 33]. Thread 1 adds the first four elements (i.e., 20, 18, 16, 14), Thread 2 adds the next four elements (i.e., 12, 10, 8, 6), , Thread 5 adds the last four elements (25, 75, 45, 33). Finally, the sum of all the 20 elements is printed by the program.

include

#include

#include

#define NUM_THREADS 3

int counter=1;

void *PrintHello(void *threadid)

{

counter = 2*counter+ (int) threadid;

printf(" Thread Id: %d Counter: %d ", threadid, counter);

pthread_exit(NULL);

}

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

{

pthread_t threads[NUM_THREADS];

int rc, t;

for(t=0;t

printf("Creating thread %d ", t);

rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);

if (rc){

printf("ERROR; return code from pthread_create() is %d ", rc);

exit(-1);

}

}

printf(" Counter: %d ", counter);

pthread_exit(NULL);

}