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#include <mpi.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
int rank, nprocs, len;
char pname[MPI_MAX_PROCESSOR_NAME];
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD,&nprocs);
MPI_Comm_rank(MPI_COMM_WORLD,&rank);
MPI_Get_processor_name(pname,&len);
printf("Hello world! from rank %d of %d on host %s\n", rank, nprocs,pname);
MPI_Finalize();
return 0;
}