diff --git a/cpp/grains/grains.cpp b/cpp/grains/grains.cpp
new file mode 100644
index 0000000..d213d8f
--- /dev/null
+++ b/cpp/grains/grains.cpp
@@ -0,0 +1,18 @@
+#include "grains.h"
+
+namespace grains {
+
+static const index_t number_of_squares = 64;
+
+
+ulong_t square(index_t index)
+{
+    return 1ULL << (index - 1);
+}
+
+ulong_t total()
+{
+    return (1ULL << number_of_squares) - 1;
+}
+
+}
diff --git a/cpp/grains/grains.h b/cpp/grains/grains.h
new file mode 100644
index 0000000..5afadd5
--- /dev/null
+++ b/cpp/grains/grains.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#define EXERCISM_RUN_ALL_TESTS
+
+
+namespace grains {
+
+typedef unsigned long long ulong_t;
+typedef unsigned int       index_t;
+
+ulong_t square(index_t index);
+ulong_t total();
+
+}