refactor: exercises for the first 4 sections

02-write-your-first-program/exercises/README.md

@@ -1,6 +1,6 @@
-1. Print your name and your best friend's name using Println twice. [Check out this challenge here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/01).
+1. **Print your name and your best friend's name** using Println twice. [Check out this exercise here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/01).
 
-2. Print your GOPATH using `go env` tool. [Check out this challenge here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/02).
+2. **Print your GOPATH** using `go env` tool. [Check out this exercise here](https://github.com/inancgumus/learngo/tree/master/02-write-your-first-program/exercises/02).
 
 3. **Say hello to yourself.**
 

03-packages-and-scopes/exercises/01-packages/main.go

@@ -8,7 +8,8 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
+// EXERCISE: Use your own package
+//
 //  Create a few Go files and call their functions from
 //  the main function.
 //

03-packages-and-scopes/exercises/02-scopes/main.go

@@ -8,7 +8,8 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
+// EXERCISE: Try the scopes
+//
 //  1. Create two files: main.go and printer.go
 //
 //  2. In printer.go:
@@ -24,9 +25,6 @@ package main
 //  4. In printer.go:
 //     1. Call the bye function from
 //        inside the hello function
-//
-//  5. In main.go:
-//     1.
 // ---------------------------------------------------------
 
 func main() {

03-packages-and-scopes/exercises/03-importing/main.go

@@ -8,7 +8,8 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
+// EXERCISE: Rename imports
+//
 //  1- Import fmt package three times with different names
 //
 //  2- Print a few messages using those imports

04-statements-expressions-comments/exercises/01-shy-semicolons/main.go

@@ -8,11 +8,13 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
-//  1. Greet a few people
-//  2. Try to type your statements separating them using
+// EXERCISE: Shy Semicolons
+//
+//  1. Try to type your statements by separating them using
 //     semicolons
-//  3. Observe how Go fixes them for you
+//
+//  2. Observe how Go fixes them for you
+//
 // ---------------------------------------------------------
 
 func main() {

04-statements-expressions-comments/exercises/01-shy-semicolons/solution/main.go

@@ -0,0 +1,23 @@
+// 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 line of code below; then save the file.
+	//
+	// You will see that Go will fix it automatically.
+	//
+	// This is because, for Go, it doesn't matter whether
+	// you use semicolons between the statements or not.
+	//
+	// It adds them automatically after all.
+
+	/*
+		fmt.Println("inanc"); fmt.Println("lina"); fmt.Println("ebru");
+	*/
+}

04-statements-expressions-comments/exercises/01/solution/main.go

@@ -1,21 +0,0 @@
-// 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 below line of code; then save the file
-	//
-	// you will see that Go will fix it automatically
-	//
-	// this is because, for Go, it doesn't matter whether
-	// you use semicolons between statements or not.
-	//
-	// it adds them automatically after all.
-
-	// fmt.Println("inanc"); fmt.Println("lina"); fmt.Println("ebru");
-}

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

@@ -8,10 +8,12 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
-//  Try to type just "Hello" on a line.
-//  Do not use Println
-//  Observe the error
+// EXERCISE: Naked Expression
+//
+//  1. Try to type just "Hello" on a line.
+//  2. Do not use Println
+//  3. Observe the error
+//
 // ---------------------------------------------------------
 
 func main() {

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.
+}

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

@@ -1,20 +0,0 @@
-// 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 to see the error
-
-	// "Hello"
-
-	// It says "evaluted but not used" because
-	// the "Hello" expression returned a value
-	// and no statement has used it
-
-	// You can't use expressions without statements
-}

04-statements-expressions-comments/exercises/03-operators-combine/main.go

@@ -8,14 +8,19 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
-//  Print the expected output using operators
+// EXERCISE: Operators combine the expressions
+//
+//  Print the expected output below using the string
+//  concatenation operator.
+//
+// HINT
+//  Use + operator multiple times to create "Hello!!!?".
 //
 // EXPECTED OUTPUT
 //  "Hello!!!?"
 // ---------------------------------------------------------
 
 func main() {
-	// use + operator below multiple times
+
 	// fmt.Println("Hello!" + ?)
 }

04-statements-expressions-comments/exercises/03-operators-combine/solution/main.go

@@ -10,7 +10,7 @@ package main
 import "fmt"
 
 func main() {
-	// Operators bind multiple expressions together
-	// as if there's a single expression
+	// Operators combine multiple expressions together
+	// as if there's a single expression.
 	fmt.Println("Hello!" + "!" + "!" + "?")
 }

04-statements-expressions-comments/exercises/04-print-go-version/main.go

@@ -8,10 +8,11 @@
 package main
 
 // ---------------------------------------------------------
-// EXERCISE
-//  1- Look at runtime package documentation
-//  2- Find the func that returns the Go version
-//  3- Print the Go version by calling that func
+// EXERCISE: Print the Go Version
+//
+//  1. Look at the runtime package documentation
+//  2. Find the func that returns the Go version
+//  3. Print the Go version by calling that func
 //
 // HINT
 //  It's here: https://golang.org/pkg/runtime

04-statements-expressions-comments/exercises/05-comment-out/main.go

@@ -10,11 +10,12 @@ package main
 import "fmt"
 
 // ---------------------------------------------------------
-// EXERCISE
-//  Use single and multiline comments to comment Printlns
+// EXERCISE: Comment out
+//
+//  Use single and multiline comments to comment Printlns.
 //
 // EXPECTED OUTPUT
-//  None
+//  You shouldn't see any output after you're done.
 // ---------------------------------------------------------
 
 func main() {