add: numbers and strings exercises

08-numbers-and-strings/02-strings/exercises/04-count-the-chars/main.go

@@ -0,0 +1,37 @@
+// 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
+
+import (
+	"fmt"
+	"os"
+)
+
+// ---------------------------------------------------------
+// EXERCISE: Count the Chars
+//
+//  1. Change the following program to work with unicode
+//     characters.
+//
+// INPUT
+//  "İNANÇ"
+//
+// EXPECTED OUTPUT
+//  5
+// ---------------------------------------------------------
+
+func main() {
+	// Currently it returns 7
+	// Because, it counts the bytes...
+	// It should count the runes (codepoints) instead.
+	//
+	// When you run it with "İNANÇ", it should return 5 not 7.
+
+	length := len(os.Args[1])
+	fmt.Println(length)
+}

08-numbers-and-strings/02-strings/exercises/04-count-the-chars/solution/main.go

@@ -0,0 +1,19 @@
+// 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
+
+import (
+	"fmt"
+	"os"
+	"unicode/utf8"
+)
+
+func main() {
+	length := utf8.RuneCountInString(os.Args[1])
+	fmt.Println(length)
+}