diff --git a/lesson#9.1/main.d b/lesson#9.1/main.d
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+//	Creating Battleship game (hints)
+//	LET'S LEARN: enums
+
+import std.stdio: writeln;
+import std.conv: to;
+
+// enum is a user defined type
+// enum TypeName { ValueName_1, ValueName_2, /* etc. */ }
+
+enum Colors {
+	RED=5, ORANGE, YELLOW, GREEN, BLUE, PURPLE, BROWN, BLACK
+}
+
+/*
+	// anonymous enum
+	enum {
+		RED=5, ORANGE, YELLOW, GREEN, BLUE, PURPLE, BROWN, BLACK
+	}
+*/
+
+void main() {
+	Colors background_color = Colors.RED;
+
+	writeln("Minimum value of Colors: ", Colors.min);
+	writeln("Maximum value of Colors: ", Colors.max);
+	writeln("Storage size of Colors:  ", Colors.sizeof);
+
+	writeln("\n"); // '\n' => new line character
+
+	writeln("value of Colors.RED:    ", Colors.RED.to!int); 	// converting to integer, otherwise it outputs RED
+	writeln("value of Colors.ORANGE: ", Colors.ORANGE.to!int); 	// converting to integer, otherwise it outputs ORANGE
+	writeln("value of Colors.YELLOW: ", Colors.YELLOW.to!int); 	// converting to integer, otherwise it outputs YELLOW
+
+/*
+	int variable = RED;
+	writeln("variable = ", RED);
+*/
+}
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