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02-write-your-first-program/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 is a special package
+// it allows Go to create an executable file
+package main
+
+/*
+This is a multi-line comment.
+
+import keyword makes another package available
+  for this .go "file".
+
+import "fmt" lets you access fmt package's functionality
+  here in this file.
+*/
+import "fmt"
+
+// "func main" is special.
+//
+// Go has to know where to start
+//
+// func main creates a starting point for Go
+//
+// After compiling the code,
+// Go runtime will first run this function
+func main() {
+	// after: import "fmt"
+	// Println function of "fmt" package becomes available
+
+	// Look at what it looks like by typing in the console:
+	//   godoc -src fmt Println
+
+	// Println is just an exported function from
+	//   "fmt" package
+
+	// Exported = First Letter is uppercase
+	fmt.Println("Hello Gopher!")
+
+	// Go cannot call Println function by itself.
+	// That's why you need to call it here.
+	// It only calls `func main` automatically.
+
+	// -----
+
+	// Go supports Unicode characters in string literals
+	// And also in source-code: KÖSTEBEK!
+	//
+	// Because: Literal ~= Source Code
+
+	// EXERCISE: Remove the comments from below --> //
+	// fmt.Println("Merhaba Köstebek!")
+
+	// Unnecessary note:
+	// "Merhaba Köstebek" means "Hello Gopher"
+	// in Turkish language
+}