SYNTAX

C Syntax

int MPI_Comm_size(MPI_Comm comm, int* size)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_COMM_SIZE(COMM, SIZE, IERROR)
    INTEGER COMM, SIZE, IERROR

Fortran 2008 Syntax

USE mpi_f08
MPI_Comm_size(comm, size, ierror)
    TYPE(MPI_Comm), INTENT(IN) :: comm
    INTEGER, INTENT(OUT) :: size
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror