Example C: Computing Pi

• #include “mpi.h”

• #include <math.h>

• int main (argc, argv)

• int argc; char *argv[];

• {

• int n, myid, numprocs, i, rc;

• double PI25DT = 3.14159265358979323842643;

• double mypi, pi, h, sum, x, a;

• MPI_Init(&argc, &argv);

• MPI_Comm_size (MPI_COMM_WORLD, &numprocs);

• MPI_Comm_rank (MPI_COMM_WORLD, &myid);

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