Examples

while (!done) 
  { 
    if (myid == 0) { 
        printf("Enter the number of intervals: (0 quits) "); 
        scanf("%d",&n); 
    } 
    MPI_Bcast(&n, 1, MPI_INT, 0, MPI_COMM_WORLD); 
    if (n == 0) break; 
 
 
    h = 1.0 / (double) n; sum = 0.0;
 
    for (i = myid + 1; i <= n; i += numprocs) {
      x = h * ((double)i - 0.5);
      sum += 4.0 / (1.0 + x*x);
    }
    mypi = h * sum;
 
    MPI_Reduce(&mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
 
    if (myid == 0) printf("pi is approximately %.16f, Error is %.16f\n", pi, fabs(pi - PI25DT));
  }
MPI_Finalize();

This category contains 2 examples, and has been viewed 56723 times.

• Calculating PI - A program to calculate the value of PI (16342 views)
• Silly Example - A basic and silly C example (16349 views)