Add shipping service.

src/shippingservice/quote.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+// Quote represents a currency value.
+type Quote struct {
+	Dollars uint32
+	Cents   uint32
+}
+
+// String representation of the Quote.
+func (q Quote) String() string {
+	return fmt.Sprintf("$%d.%d", q.Dollars, q.Cents)
+}
+
+// CreateQuoteFromCount takes a number of items and returns a Price struct.
+func CreateQuoteFromCount(count int) Quote {
+	return CreateQuoteFromFloat(quoteByCountFloat(count))
+}
+
+// CreateQuoteFromFloat takes a price represented as a float and creates a Price struct.
+func CreateQuoteFromFloat(value float64) Quote {
+	units, fraction := math.Modf(value)
+	return Quote{
+		uint32(units),
+		uint32(math.Trunc(fraction * 100)),
+	}
+}
+
+// quoteByCountFloat takes a number of items and generates a price quote represented as a float.
+func quoteByCountFloat(count int) float64 {
+	if count == 0 {
+		return 0
+	}
+	count64 := float64(count)
+	var p float64 = 1 + (count64 * 0.2)
+	return count64 + math.Pow(3, p)
+}