#include <mpi.h>
#include <stdio.h>
int main(int argc, char** argv)
{
// Initialize the MPI environment
MPI_Init(NULL, NULL);
// Get the number of processes
int world_size;
MPI_Comm_size(MPI_COMM_WORLD, &world_size);
// Get the rank of the process
int world_rank;
MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
printf("Inside A: rank %d out of %d\n", world_rank, world_size);
const char* command = " mpiexec -n 4 b.exe Program_B";
if(world_rank==0)
{
printf("trying to run: %s\n",command);
system(command);

}
// Finalize the MPI environment.
MPI_Finalize();
}