add: array exercises

14-arrays/exercises/11-average/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: Find the Average
+//
+//  Your goal is to fill an array with numbers and find the average.
+//
+//  1. Get the numbers from the command-line.
+//
+//  2. Create an array and assign the given numbers to that array.
+//
+//  3. Print the given numbers and their average.
+//
+// RESTRICTION
+//   + Maximum 5 numbers can be provided
+//   + If one of the arguments are not a valid number, skip it
+//
+// EXPECTED OUTPUT
+//   go run main.go
+//     Please tell me numbers (maximum 5 numbers).
+//
+//   go run main.go 1 2 3 4 5 6
+//     Please tell me numbers (maximum 5 numbers).
+//
+//   go run main.go 1 2 3 4 5
+//     Your numbers: [1 2 3 4 5]
+//     Average: 3
+//
+//   go run main.go 1 a 2 b 3
+//     Your numbers: [1 0 2 0 3]
+//     Average: 2
+// ---------------------------------------------------------
+
+func main() {
+}

14-arrays/exercises/11-average/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"
+	"strconv"
+)
+
+func main() {
+	args := os.Args[1:]
+	if l := len(args); l == 0 || l > 5 {
+		fmt.Println("Please tell me numbers (maximum 5 numbers).")
+		return
+	}
+
+	var (
+		sum   float64
+		nums  [5]float64
+		total float64
+	)
+
+	for i, v := range args {
+		n, err := strconv.ParseFloat(v, 64)
+		if err != nil {
+			continue
+		}
+
+		total++
+		nums[i] = n
+		sum += n
+	}
+
+	fmt.Println("Your numbers:", nums)
+	fmt.Println("Average:", sum/total)
+}