Hello world

sem1/hello.c

@@ -0,0 +1,10 @@
+#include <mpi.h> 
+#include <stdio.h>
+int main(int argc, char *argv[]){  
+    int commsize, my_rank;
+    MPI_Init(&argc,&argv);  
+    MPI_Comm_size(MPI_COMM_WORLD, &commsize);
+    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
+    printf ("Communicator size= %d My rank= %d\n", commsize,my_rank);  
+    MPI_Finalize();
+}