Reorganize packages

src/examples/hello/hello.go

@@ -0,0 +1,41 @@
+
+package main
+
+const SIX = 6
+
+func main() {
+	println("Hello world from Go!")
+	println("The answer is:", calculateAnswer())
+	println("5 ** 2 =", square(5))
+	println("3 + 12 =", add(3, 12))
+	println("fib(11) =", fib(11))
+	println("sumrange(100) =", sumrange(100))
+}
+
+func calculateAnswer() int {
+	seven := 7
+	return SIX * seven
+}
+
+func square(n int) int {
+	return n * n
+}
+
+func add(a, b int) int {
+	return a + b
+}
+
+func fib(n int) int {
+	if n <= 2 {
+		return 1
+	}
+	return fib(n - 1) + fib(n - 2)
+}
+
+func sumrange(n int) int {
+	sum := 0
+	for i := 1; i <= n; i++ {
+		sum += i
+	}
+	return sum
+}