binary-trees Go #7 program

/* The Computer Language Benchmarks Game
 * https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
 *
 * contributed by Anthony Perez-Sanz.
 * based on Java program by Jarkko Miettinen
 * *reset*
 */

package main

import (
   "flag"
   "fmt"
   "strconv"
)

type Node struct {
   left, right *Node
}

const minDepth = 4

func trees(maxDepth int) {
   longLastingNode := createTree(maxDepth)
   depth := 4

   for depth <= maxDepth {
      iterations := 1 << uint(maxDepth-depth+minDepth) // 16 << (maxDepth - depth)

      loops(iterations, depth)
      depth += 2
   }
   fmt.Printf("long lived tree of depth %d\t check: %d\n", maxDepth,
      checkTree(longLastingNode))
}

func loops(iterations, depth int) {
   check := 0
   item := 0
   for item < iterations {
      check += checkTree(createTree(depth))
      item++
   }
   fmt.Printf("%d\t trees of depth %d\t check: %d\n",
      iterations, depth, check)
}

func checkTree(n *Node) int {
   if n.left == nil {
      return 1
   }
   return checkTree(n.left) + checkTree(n.right) + 1
}

func createTree(depth int) *Node {
   node := &Node{}
   if depth > 0 {
      depth--
      node.left = createTree(depth)
      node.right = createTree(depth)
   }
   return node
}

func main() {
   n := 0
   flag.Parse()
   if flag.NArg() > 0 {
      n, _ = strconv.Atoi(flag.Arg(0))
   }

   maxDepth := n
   if minDepth+2 > n {
      maxDepth = minDepth + 2
   }

   {
      stretchDepth := maxDepth + 1
      check := checkTree(createTree(stretchDepth))
      fmt.Printf("stretch tree of depth %d\t check: %d\n", stretchDepth, check)
   }
   trees(maxDepth)
}
    

NOTES:
64-bit Ubuntu quad core
go version go1.14 linux/amd64


Wed, 06 May 2020 00:11:02 GMT

MAKE:
/opt/src/go1.14.linux-amd64/go/bin/go build -o binarytrees.go-7.go_run

6.62s to complete and log all make actions

COMMAND LINE:
./binarytrees.go-7.go_run 21

PROGRAM OUTPUT:
stretch tree of depth 22	 check: 8388607
2097152	 trees of depth 4	 check: 65011712
524288	 trees of depth 6	 check: 66584576
131072	 trees of depth 8	 check: 66977792
32768	 trees of depth 10	 check: 67076096
8192	 trees of depth 12	 check: 67100672
2048	 trees of depth 14	 check: 67106816
512	 trees of depth 16	 check: 67108352
128	 trees of depth 18	 check: 67108736
32	 trees of depth 20	 check: 67108832
long lived tree of depth 21	 check: 4194303