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# Convert Lat/Lon to TWD97
# Ref: http://fyyang.blogspot.tw/2012/09/python-twd97.html
from math import tan, sin, cos, radians  # Using math.tan, math.sin, math.cos, math.radians


class LatLngToTWD97(object): # class for convert
    """This object provide method for converting lat/lng coordinate to TWD97
    coordinate
    The reference to:
    http://blog.ez2learn.com/2009/08/15/lat-lon-to-twd97/

edingroot

// Ref: https://kuro.tw/posts/2015/06/11/js-note-twd97-convert-to-longitude-and-latitude/

function twd97_to_latlng($x, $y) {
    var pow = Math.pow, M_PI = Math.PI;
    var sin = Math.sin, cos = Math.cos, tan = Math.tan;
    var $a = 6378137.0, $b = 6356752.314245;
    var $lng0 = 121 * M_PI / 180, $k0 = 0.9999, $dx = 250000, $dy = 0;
    var $e = pow((1 - pow($b, 2) / pow($a, 2)), 0.5);
    $x -= $dx;
    $y -= $dy;

edingroot

public class Main {

    public static void main(String[] args) {
        int num = -32700;

        // Signed int to 2 bytes (32767 ~ -32768)
        byte b0, b1;
        b1 = (byte) ((num & 0xff00) >> 8);
        b0 = (byte) (num & 0xff);

edingroot

/**
 * NOTE: node id should start from 1
 * topo.txt format (see the end of this file for example):
 *  #row id1 id2 cost
 *  0    1   2   2.0
 */

#include <stdio.h>
#include <stdlib.h>
#include <vector>

edingroot

function fract(x) {
    return x - Math.floor(x);
}

function packFloat(x) {
    let s = x > 0 ? 1 : -1;
    let e = Math.floor(Math.log2(s * x));
    let m = s * x / Math.pow(2, e);
    return [
        Math.floor(fract((m - 1) * 256 * 256) * 256),

edingroot

/**
 * Numerical Computation HW1.2 / by Chi Chang
 * Ref:
 *   http://en.cppreference.com/w/cpp/numeric/math/fpclassify
 *   http://en.cppreference.com/w/cpp/types/numeric_limits/signaling_NaN
 *   https://en.wikipedia.org/wiki/NaN
 */
 
#include <iostream>
#include <cmath>

edingroot

// PS. Another approach with Observable: https://stackoverflow.com/a/36383691

import io.reactivex.BackpressureStrategy;
import io.reactivex.Flowable;
import io.reactivex.schedulers.Schedulers;

public class ParallelFlowableLimit {
    public static void main(String[] args) {
        // Flowable.range(0, 10)
        Flowable.create(emitter -> {

edingroot

CC := g++

INCLUDE_PATH = -Isrc/http_server/core
CPPFLAGS := -std=c++14 $(INCLUDE_PATH)

HTTP_SERVER_SOURCES = $(shell find ./src/http_server -type f -name '*.cpp')
HTTP_SERVER_OBJS = $(HTTP_SERVER_SOURCES:%.cpp=%.o)

CONSOLE_CGI_SOURCES = $(shell find ./src/console_cgi -type f -name '*.cpp')
CONSOLE_CGI_OBJS = $(CONSOLE_CGI_SOURCES:%.cpp=%.o)

edingroot

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

edingroot

#!/bin/sh
tstart=$(date +%s%N)
cstart=$(cat /sys/fs/cgroup/cpu/cpuacct.usage)

sleep 5

tstop=$(date +%s%N)
cstop=$(cat /sys/fs/cgroup/cpu/cpuacct.usage)

bc -l <<EOF