add: constants exercises

10-constants/exercises/03-constant-length/main.go

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+// 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
+
+// ---------------------------------------------------------
+// EXERCISE: Constant Length
+//
+//  Calculate how many characters inside the `home`
+//  constant and print it.
+//
+// STEPS:
+//  1. Declare a constant named `home`
+//  2. Initialize it to "Milky Way Galaxy" string literal
+//
+//  3. Declare another constant named `length`
+//  4. Initialize it by using the built-in function `len`.
+//
+//  5. Print the message below using the constants that
+//     you've declared.
+//
+// RESTRICTION:
+//  Use Printf.
+//  Print the `home` constant using the quoted-string verb.
+//
+// EXPECTED OUTPUT
+//  There are 16 characters inside "Milky Way Galaxy"
+// ---------------------------------------------------------
+
+func main() {
+}