add: switch statement exercises

12-switch/exercises/02-richter-scale-2/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: Richter Scale #2
+//
+//  Repeat the previous exercise.
+//
+//  But, this time, get the description and print the
+//  corresponding richter scale.
+//
+//  See the expected outputs.
+//
+// ---------------------------------------------------------
+// MAGNITUDE                    DESCRIPTION
+// ---------------------------------------------------------
+// Less than 2.0                micro
+// 2.0 to less than 3.0         very minor
+// 3.0 to less than 4.0         minor
+// 4.0 to less than 5.0         light
+// 5.0 to less than 6.0         moderate
+// 6.0 to less than 7.0         strong
+// 7.0 to less than 8.0         major
+// 8.0 to less than 10.0        great
+// 10.0 or more                 massive
+//
+// EXPECTED OUTPUT
+//  go run main.go
+//   Tell me the magnitude of the earthquake in human terms.
+//
+//  go run main.go aliens
+//   alien's richter scale is unknown
+//
+//  go run main.go micro
+//   micro's richter scale is less than 2.0
+//
+//  go run main.go "very minor"
+//   very minor's richter scale is 2 - 2.9
+//
+//  go run main.go minor
+//   minor's richter scale is 3 - 3.9
+//
+//  go run main.go light
+//   light's richter scale is 4 - 4.9
+//
+//  go run main.go moderate
+//   moderate's richter scale is 5 - 5.9
+//
+//  go run main.go strong
+//   strong's richter scale is 6 - 6.9
+//
+//  go run main.go major
+//   major's richter scale is 7 - 7.9
+//
+//  go run main.go great
+//   great's richter scale is 8 - 8.9
+//
+//  go run main.go massive
+//   massive's richter scale is 10+
+// ---------------------------------------------------------
+
+func main() {
+}

12-switch/exercises/02-richter-scale-2/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"
+	"os"
+)
+
+func main() {
+	args := os.Args
+	if len(args) != 2 {
+		fmt.Println("Tell me the magnitude of the earthquake in human terms.")
+		return
+	}
+
+	var richter string
+
+	desc := args[1]
+
+	switch desc {
+	case "micro":
+		richter = "less than 2.0"
+	case "very minor":
+		richter = "2 - 2.9"
+	case "minor":
+		richter = "3 - 3.9"
+	case "light":
+		richter = "4 - 4.9"
+	case "moderate":
+		richter = "5 - 5.9"
+	case "strong":
+		richter = "6 - 6.9"
+	case "major":
+		richter = "7 - 7.9"
+	case "great":
+		richter = "8 - 8.9"
+	case "massive":
+		richter = "10+"
+	default:
+		richter = "unknown"
+	}
+
+	fmt.Printf(
+		"%s's richter scale is %s\n",
+		desc, richter,
+	)
+}