add: string quiz + execises

19-strings-runes-bytes/exercises/02-print-the-runes/main.go

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+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Print the runes
+//
+//  1. Loop over the "console" word and print its runes one by one,
+//     in decimals, hexadecimals and binary.
+//
+//  2. Manually put the runes of the "console" word to a byte slice, one by one.
+//
+//     As the elements of the byte slice use only the rune literals.
+//
+//     Print the byte slice.
+//
+//  3. Repeat the step 2 but this time, as the elements of the byte slice,
+//     use only decimal numbers.
+//
+//  4. Repeat the step 2 but this time, as the elements of the byte slice,
+//     use only hexadecimal numbers.
+//
+//
+// EXPECTED OUTPUT
+//   Run the solution to see the expected output.
+// ---------------------------------------------------------
+
+func main() {
+	const word = "console"
+}

19-strings-runes-bytes/exercises/02-print-the-runes/solution/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
+
+import "fmt"
+
+func main() {
+	const word = "console"
+
+	for _, w := range word {
+		fmt.Printf("%c\n", w)
+		fmt.Printf("\tdecimal: %[1]d\n", w)
+		fmt.Printf("\thex    : 0x%[1]x\n", w)
+		fmt.Printf("\tbinary : 0b%08[1]b\n", w)
+	}
+
+	// print the word manually using runes
+	fmt.Printf("with runes       : %s\n",
+		string([]byte{'c', 'o', 'n', 's', 'o', 'l', 'e'}))
+
+	// print the word manually using decimals
+	fmt.Printf("with decimals    : %s\n",
+		string([]byte{99, 111, 110, 115, 111, 108, 101}))
+
+	// print the word manually using hexadecimals
+	fmt.Printf("with hexadecimals: %s\n",
+		string([]byte{0x63, 0x6f, 0x6e, 0x73, 0x6f, 0x6c, 0x65}))
+}