add: constants exercises

10-constants/exercises/05-area/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: Area
+//
+//  Fix the following program.
+//
+// RESTRICTION
+//  You should not use any variables.
+//
+// EXPECTED OUTPUT
+//  area = 1250
+// ---------------------------------------------------------
+
+func main() {
+	// const (
+	// 	width  int16 = 25
+	// 	height int32 = width * 2
+	// )
+
+	// fmt.Printf("area = %d\n", width*height)
+}