refactor: exercises for the first 4 sections

04-statements-expressions-comments/exercises/02-naked-expression/solution/main.go

@@ -0,0 +1,25 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+func main() {
+	// Uncomment the code line below to see the error.
+
+	/*
+		"Hello"
+	*/
+
+	// It will say: "evaluted but not used"
+	//
+	// Because:
+	// "Hello" literal returns a value but there isn't any
+	// statement which uses it.
+	//
+	// So:
+	// You can't use expressions alone without statements.
+}