add: quiz and exercises to pointers

26-pointers/exercises/02-swap/solution/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"
+
+func main() {
+	a, b := 3.14, 6.28
+	swap(&a, &b)
+	fmt.Printf("a : %g — b : %g\n", a, b)
+
+	pa, pb := &a, &b
+	pa, pb = swapAddr(pa, pb)
+	fmt.Printf("pa: %p — pb: %p\n", pa, pb)
+	fmt.Printf("pa: %g — pb: %g\n", *pa, *pb)
+}
+
+func swap(a, b *float64) {
+	*a, *b = *b, *a
+}
+
+func swapAddr(a, b *float64) (*float64, *float64) {
+	return b, a
+}