add: switch statement exercises

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)
+}