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#include <stdio.h>
#include <mpi.h>
 
 
int main (argc, argv)
     int argc;
     char *argv[];
{
  int rank, size;
 
  MPI_Init (&argc, &argv);    /* starts MPI */
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);	/* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);	/* get number of processes */
int i,s=0;
for(i=1;i<=100;i++)
s+=i;
printf("%d\n",s);
  printf( "Hello world from process %d of %d\n", rank, size );
  MPI_Finalize();
  return 0;
}

prog.c:2:17: error: mpi.h: No such file or directory
prog.c: In function ‘main’:
prog.c:11: warning: implicit declaration of function ‘MPI_Init’
prog.c:12: warning: implicit declaration of function ‘MPI_Comm_rank’
prog.c:12: error: ‘MPI_COMM_WORLD’ undeclared (first use in this function)
prog.c:12: error: (Each undeclared identifier is reported only once
prog.c:12: error: for each function it appears in.)
prog.c:13: warning: implicit declaration of function ‘MPI_Comm_size’
prog.c:19: warning: implicit declaration of function ‘MPI_Finalize’

Standard output is empty