cypok

The problem was fixed in less than a day after publication of this page.

The problem

Speaker Deck uses nice OpenSans font. However some characters are rendered using other fonts, e.g. cyrillic characters.

So if you mix in description both latin and cyrillic characters it looks bad. Latin characters are rendered using [lite 300 OpenSans

cypok

public class Absents {
    public static void main(String args[]) {
        try { callClone(null); } catch (Throwable e) { System.out.println(e); }
        try { callToString(null); } catch (Throwable e) { System.out.println(e); }
    }


    static void callClone(Fail[] arr) {
        arr.clone();
    }

cypok

Original post at Coursera's proglang discussion forum is here.

After reviewing code of other students I formulated one very common problem: mixing tabs and spaces.

If student writes his code in editor which inserts tabs as is (as '\t' character) it is OK. However when student starts to add extra formatting with spaces (e.g. align if, then and else) his code becomes a problem. Look at the example with tab width 4 (tabs are shown as ->, spaces as spaces):

cypok

(*
  ---> means tab 
  . means space
*)

(* Student 1 write like this and assumes ts=4 ... *)
fun get_nth (s: string list, n: int)=
....if n=0
....then ""
....else

cypok

#!/usr/bin/env ruby

# Usage example: sml hw1test.sml | truecolor.rb

require 'colorize'

true_pat = /\btrue\b/
false_pat = /\bfalse\b/

true_count = 0

cypok

#include <iostream>
#include <stdexcept>

using namespace std;

class A {

public:

    /**

cypok

import scala.annotation.tailrec

object TestRun extends App {
  val tree = Leaf.add(10).add(5).add(7)
  println(tree.valuesByBreadth mkString ", ")
}

abstract sealed class Tree[+A] {
  import Ordered._

cypok

scala> implicit class CutString (self: String) {
     |   def cutTo(sz: Int) = if (self.length > sz) self.substring(0, sz) else self
     | }
defined class CutString

scala> "abc".cutTo(5)
res6: String = abc

scala> "abcdef".cutTo(5)
res7: String = abcde

cypok

#include <stdio.h>
#include <Windows.h>

// Pay attention to "^"
#define MSVC_PATH "C:\\Program^ Files^ ^(x86^)\\Microsoft^ Visual^ Studio^ 10.0\\VC"

#define APP_C "hello.c"
#define APP_EXE "hello.exe"

// This function generates simple C-program.

cypok

-- Algorithm description: http://en.wikipedia.org/wiki/Graham_scan
-- Task from Real World Haskell: http://book.realworldhaskell.org/read/defining-types-streamlining-functions.html#id588205

data Direction = DirLeft | DirRight | DirStraight
                 deriving(Show)

data Point = Point { pointX :: Double, pointY :: Double }
             deriving(Show,Eq)

subPoints a b = Point ((pointX a) - (pointX b)) ((pointY a) - (pointY b))