update: foundations

x-tba/foundations/area-of-a-circle/main.go

@@ -0,0 +1,29 @@
+// 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"
+	"math"
+)
+
+func main() {
+	var (
+		radius = 10.
+		area   float64
+	)
+
+	area = math.Pi * radius * radius
+
+	fmt.Printf("radius: %g -> area: %.2f\n",
+		radius, area)
+
+	// ALTERNATIVE:
+	// math.Pow calculates the power of a float number
+	// area = math.Pi * math.Pow(radius, 2)
+}