diff --git a/cs677/hw6/src/Makefile b/cs677/hw6/src/Makefile
new file mode 100644
index 0000000..a320024
--- /dev/null
+++ b/cs677/hw6/src/Makefile
@@ -0,0 +1,11 @@
+
+FILE := mpi-round-trip
+TARGET := $(FILE)
+
+all: $(TARGET)
+
+$(TARGET): $(FILE).cc
+	mpiCC -o $@ $<
+
+clean:
+	-rm -f *.o *~ $(TARGET)
diff --git a/cs677/hw6/src/mpi-round-trip.cc b/cs677/hw6/src/mpi-round-trip.cc
new file mode 100644
index 0000000..23dfcf2
--- /dev/null
+++ b/cs677/hw6/src/mpi-round-trip.cc
@@ -0,0 +1,30 @@
+
+#include <iostream.h>
+#include <mpi.h>
+using namespace std;
+
+int main(int argc, char * argv[])
+{
+    int my_rank;
+
+    MPI_Init(&argc, &argv);
+    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
+
+    if (my_rank == MASTER)
+    {
+        int buf = 0;
+        MPI_Recv(&buf, sizeof(buf), MPI_CHAR,
+            MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD);
+        cout << "Master received " << buf << endl;
+    }
+    else
+    {
+        int forty_two = 42;
+        MPI_Send(&forty_two, sizeof(forty_two), MPI_CHAR,
+            MASTER, 42, MPI_COMM_WORLD);
+    }
+
+    MPI_Finalize();
+
+    return 0;
+}