add: switch statement exercises

12-switch/exercises/01-richter-scale/main.go

@@ -0,0 +1,73 @@
+// 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
+
+// ---------------------------------------------------------
+// STORY
+//  You're curious about the richter scales. When reporters
+//  say: "There's been a 5.5 magnitude earthquake",
+//
+//  You want to know what that means.
+//
+//  So, you've decided to write a program to do that for you.
+//
+// EXERCISE: Richter Scale
+//
+//  1. Get the earthquake magnitude from the command-line.
+//  2. Display its corresponding description.
+//
+// ---------------------------------------------------------
+// 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
+//    Give me the magnitude of the earthquake.
+//
+//  go run main.go ABC
+//    I couldn't get that, sorry.
+//
+//  go run main.go 0.5
+//    0.50 is micro
+//
+//  go run main.go 2.5
+//    2.50 is very minor
+//
+//  go run main.go 3
+//    3.00 is minor
+//
+//  go run main.go 4.5
+//    4.50 is light
+//
+//  go run main.go 5
+//    5.00 is moderate
+//
+//  go run main.go 6
+//    6.00 is strong
+//
+//  go run main.go 7
+//    7.00 is major
+//
+//  go run main.go 8
+//    8.00 is great
+//
+//  go run main.go 11
+//    11.00 is massive
+// ---------------------------------------------------------
+
+func main() {
+}

12-switch/exercises/01-richter-scale/solution/main.go

@@ -0,0 +1,53 @@
+// 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"
+	"strconv"
+)
+
+func main() {
+	args := os.Args
+	if len(args) != 2 {
+		fmt.Println("Give me the magnitude of the earthquake.")
+		return
+	}
+
+	richter, err := strconv.ParseFloat(args[1], 64)
+	if err != nil {
+		fmt.Println("I couldn't get that, sorry.")
+		return
+	}
+
+	var desc string
+
+	switch r := richter; {
+	case r < 2:
+		desc = "micro"
+	case r >= 2 && r < 3:
+		desc = "very minor"
+	case r >= 3 && r < 4:
+		desc = "minor"
+	case r >= 4 && r < 5:
+		desc = "light"
+	case r >= 5 && r < 6:
+		desc = "moderate"
+	case r >= 6 && r < 7:
+		desc = "strong"
+	case r >= 7 && r < 8:
+		desc = "major"
+	case r >= 8 && r < 10:
+		desc = "great"
+	default:
+		desc = "meteoric"
+	}
+
+	fmt.Printf("%.2f is %s\n", richter, desc)
+}