Test of MPI_Comm_rank/size/functions

Makefile

@@ -1,7 +1,9 @@
 MPICC = mpicc
 CFLAGS += -g
-all: example
+all: example example2
 example: example.c
 	$(MPICC) $(CFLAGS) $(LDFLAGS) $? $(LDLIBS) -o $@
+example2: example2.c
+	$(MPICC) $(CFLAGS) $(LDFLAGS) $? $(LDLIBS) -o $@
 clean:
-	rm -f example
+	rm -f example example2

example2.c

@@ -0,0 +1,12 @@
+#include"mpi.h"
+#include<stdio.h>
+
+int main(int argc, char **argv){
+int rank, size;
+MPI_Init( &argc, &argv);
+MPI_Comm_rank( MPI_COMM_WORLD, &rank);
+MPI_Comm_size( MPI_COMM_WORLD, &size);
+printf("Hello world! I'm process %d of %d\n", rank, size);
+MPI_Finalize();
+return 0;
+}