add: array exercises

14-arrays/exercises/09-currency-converter/solution/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	const (
+		EUR = iota
+		GBP
+		JPY
+	)
+
+	rates := [...]float64{
+		EUR: 0.88,
+		GBP: 0.78,
+		JPY: 113.02,
+	}
+
+	args := os.Args[1:]
+	if len(args) != 1 {
+		fmt.Println("Please provide the amount to be converted.")
+		return
+	}
+
+	amount, err := strconv.ParseFloat(args[0], 64)
+	if err != nil {
+		fmt.Println("Invalid amount. It should be a number.")
+		return
+	}
+
+	fmt.Printf("%.2f USD is %.2f EUR\n", amount, rates[EUR]*amount)
+	fmt.Printf("%.2f USD is %.2f GBP\n", amount, rates[GBP]*amount)
+	fmt.Printf("%.2f USD is %.2f JPY\n", amount, rates[JPY]*amount)
+}