package main

import (
	"fmt"
	"os"
	"time"
	"strconv"
)

func members() []string {
	arr := []string{"Haruhi", "Mikuru", "Yuki", "Itsuki", "Kyon"}
	return arr
}
func task_strcat1(loop int) string {
	m := members()
	s1 := m[0]
	s2 := m[1]
	s3 := m[2]
	s4 := m[3]
	s5 := m[4]
	out := ""
	for i := 0; i < loop; i++ {
		buf := ""
		buf = "<table>\n"
		for j := 0; j < 20; j++ {
			buf += "  <tr>\n<td>" + s1 + "</td>\n<td>" + s2 + "</td>\n<td>" + s3 + "</td>\n<td>" + s4 + "</td>\n<td>" + s5 + "</td>\n</tr>\n"
		}
		buf += "</table>\n"
		out = buf
	}
	//verify(out)
	return out
}

func task_strcat_orig(loop int) string {
  m := members()
  s1 := m[0]; s2 := m[1]; s3 := m[2]; s4 := m[3]; s5 := m[4];
  out := ""
  for i := 0; i < loop; i++ {
    buf := ""
    buf += `<table>
`;  for j := 0; j < 20; j++ {
    buf += `  <tr>
    <td>` + s1 + `</td>
    <td>` + s2 + `</td>
    <td>` + s3 + `</td>
    <td>` + s4 + `</td>
    <td>` + s5 + `</td>
  </tr>
`;  }
    buf += `</table>
`;
    out = buf
  }
  return out
}
func run(loop int, empty_time float64, body func(int) string, title string) float64 {
	fmt.Printf("%-45s", title)
	start := time.Nanoseconds()
	body(loop)
	stop := time.Nanoseconds()
	real := float64(stop-start) / (1000 * 1000 * 1000)
	actual := real - empty_time
	fmt.Printf(" %10.3f %10.3f\n", real, actual)
	return real
}

func main() {
	loop := 100000
	if os.Getenv("N") != "" {
		n, err := strconv.Atoi(os.Getenv("N"))
		if err != nil {
			os.Stderr.WriteString("*** can't convert N\n")
		} else {
			loop = n
		}
	}
	fmt.Printf("*** loop=%d\n", loop)
	cycle := 3
	if os.Getenv("C") != "" {
		c, err := strconv.Atoi(os.Getenv("C"))
		if err != nil {
			os.Stderr.WriteString("*** can't convert C\n")
		} else {
			cycle = c
		}
	}
	for i := 1; i <= cycle; i++ {
		fmt.Printf("\n")
		fmt.Printf("%-45s %10s %10s\n", "# cycle="+strconv.Itoa(i), "real", "actual")
		empty_time := 0.0
		run(loop, empty_time, task_strcat1, `str+=s1+s2+s3`)
		run(loop, empty_time, task_strcat_orig, `(original) str+=s1+s2+s3`)
	}
}