shaikhul

Oh shit C!

Some C examples for quick reference.

Strings

// remember the null terminator!
char greet[] = {'H', 'e', 'l', 'l', 'o', '\0'};

int len = sizeof(greet) / sizeof(char);
for (i = 0; i < len; i++) {

shaikhul

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __str__(self):
        return 'Stringified Point: ({x}, {y})'.format(x=self.x, y=self.y)

    def __repr__(self):
        return 'Representing Point: ({x}, {y})'.format(x=self.x, y=self.y)

shaikhul

/**
Run it at https://repl.it/repls/PunyDisguisedDalmatian
*/
class Foo {
  public void helloFoo() {
    System.out.println("Hello Foo");
  }
  
  public Foo getContext() {
    return this;

shaikhul

Strace cheat sheet

• trace an executable: strace ls
• trace specific system call: strace -e open ls
• trace multiple system call: strace -e trace=open,read,write ls
• save trace output: strace -o ls.txt ls
• trace a running linux process: sudo strace -p pid
• print timestamp: strace -t ls
• gerate stat: strace -c ls

Ref: http://www.thegeekstuff.com/2011/11/strace-examples/

shaikhul

Start new session

tmux new -s session_name

Prefix Key - Ctrl+b

Panes (split window)

• vertical: Ctrl+b %
• horizontal: Ctrl+b "
• kill pane: Ctrl+b x

shaikhul

<?php
/**
* Single Responsiblity Principle client code
*/

// create a book instance, book has no knowledge about rendering
$book = new Book();
$book->setTitle("Some Title");
$book->setAuthor("Some Author");

shaikhul

<?php

class HTMLRenderer implements RendererInterface {
  public function render($data) {
    return "<p>{$data}</p>";
  }
}

shaikhul

<?php

class PlainTextRenderer implements RendererInterface {
  public function render($data) {
    return $data;
  }
}

shaikhul

<?php
/**
* RendererInterface 
*/
interface RendererInterface {
  public function render();
}

shaikhul

<?php 
/**
* Book Plain Old PHP class 
*/
class Book {
    
    private $title;                                                    
    private $author;                                                   
    private $current_page;