In this example we will see the use of parallel construct with private and firstprivate clauses. At the end of the program i and j remain undefined as these are private to thread in parallel construct.

#include

int main()

{

int i, j;

i = 1;

j = 2;

#pragma omp parallel private(i) firstprivate(j)

{

i = 3;

j = j + 2;

}

printf("%d %d\n", i, j); /* i and j are undefined */

return 0;

}

In the following example, each thread in the parallel region decides what part of the global array x to work on, based on the thread number.