Family Day update

Task/Executable-library/Go/executable-library-3.go

@@ -0,0 +1,19 @@
+// hailstone.go
+package main
+
+import "fmt"
+
+func main() {
+    freq := make(map[int]int)
+    for i := 1; i < 100000; i++ {
+        freq[len(hailstone(i, nil))]++
+    }
+    var mk, mv int
+    for k, v := range freq {
+        if v > mv {
+            mk = k
+            mv = v
+        }
+    }
+    fmt.Printf("\nThe Hailstone length returned most is %d, which occurs %d times.\n", mk, mv)
+}