\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{super\_fly}
\pdfinfo{
  /Title (computer-science-ics-3u.pdf)
  /Creator (Cheatography)
  /Author (super\_fly)
  /Subject (Computer Science ICS 3U Cheat Sheet)
}

% Lengths and widths
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\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
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\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A3A3A3}
\definecolor{LightBackground}{HTML}{F3F3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Computer Science ICS 3U Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{super\_fly} via \textcolor{DarkBackground}{\uline{cheatography.com/22009/cs/4396/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}super\_fly \\
  \uline{cheatography.com/super-fly} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 15th June, 2015.\\
   Updated 12th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Computer Components and Calculations}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/super-fly_1434328596_Copy of 0.1 Computer Components and Calculations (MAKE A COPY).png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{General process for all languages. Appearances may vary}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Computer Components in Excution}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{CPU + RAM = {\bf{Program.}} CPU = 1 billion executions/sec. Steps called Machine Cycle. \newline % Row Count 2 (+ 2)
{\bf{CPU}} = Ctrl unit\textasciicircum{}instructions\textasciicircum{}+ Logic(ALU)\textasciicircum{}math\textasciicircum{} \newline % Row Count 4 (+ 2)
Calculating a single instruction: \newline % Row Count 5 (+ 1)
1. {\bf{Fetch}}         2.{\bf{ Decode}}         3. {\bf{Execute}}         4. {\bf{Store}} \newline % Row Count 7 (+ 2)
{\bf{internal clock}}: sync computer operations% Row Count 8 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Machine Cycle}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/super-fly_1434329148_Copy of 0.1 Computer Components and Calculations (Tiger Ren).png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Programming Languages \& Developing Process}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{C.S: Math + Engineering + Science \newline % Row Count 1 (+ 1)
Skill 1: Problem Solving \newline % Row Count 2 (+ 1)
C.S: what can be computed? Solution -\textgreater{} Algorithm \newline % Row Count 3 (+ 1)
{\bf{High level Language}} User intrepretable (s.c) \newline % Row Count 4 (+ 1)
{\bf{Low level Language}} Machine interpretative \newline % Row Count 5 (+ 1)
Processing High Level Languages: \newline % Row Count 6 (+ 1)
1. Interpreting: (read and execute) \newline % Row Count 7 (+ 1)
2. Compiling  (translate completely) \newline % Row Count 8 (+ 1)
Compiling VS Interpreting: \newline % Row Count 9 (+ 1)
Once compiled, execute over and over \newline % Row Count 10 (+ 1)
Interpreted program lets the user know bugs \newline % Row Count 11 (+ 1)
{\bf{Outcome}} Applications Software \& OS% Row Count 12 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Information processing cycle}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{1: {\bf{input}}         2: {\bf{processing}}         3:{\bf{output}}         4.{\bf{storage}}% Row Count 2 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Error Types}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Run-Time Errors: \newline % Row Count 1 (+ 1)
occurs when the program is running (e.g division by 0) \newline % Row Count 3 (+ 2)
or using a undefined variable \newline % Row Count 4 (+ 1)
Exception Handling:  \newline % Row Count 5 (+ 1)
detect cases where r.t errors would occur \newline % Row Count 6 (+ 1)
Specific Exception Handling: \newline % Row Count 7 (+ 1)
specifying the error type \newline % Row Count 8 (+ 1)
argument of an exception: \newline % Row Count 9 (+ 1)
you can capture an exception's argument by supplying a variable in the except clause \newline % Row Count 11 (+ 2)
e.g \newline % Row Count 12 (+ 1)
`    answer = raw\_input("choose a, b, or c:")` \newline % Row Count 13 (+ 1)
`    if answer != "a" and answer !="b" and answer !="c":` \newline % Row Count 15 (+ 2)
`        raise ValueError("Question 1: Invalid Input: please enter a, b, or c")` \newline % Row Count 17 (+ 2)
`    else:` \newline % Row Count 18 (+ 1)
`        print "thank you"` \newline % Row Count 19 (+ 1)
`except ValueError, errorvar:` \newline % Row Count 20 (+ 1)
`    print errorvar`% Row Count 21 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Varibles}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{anything in quotes are assigned as a string \newline % Row Count 1 (+ 1)
pure numbers are assigned as integers \newline % Row Count 2 (+ 1)
decimal is assigned as float \newline % Row Count 3 (+ 1)
{\bf{Rules}} \newline % Row Count 4 (+ 1)
Case sensitive \newline % Row Count 5 (+ 1)
\seqsplit{\_use\_underscore\_for\_spaces} \newline % Row Count 6 (+ 1)
must begin wiht letter \newline % Row Count 7 (+ 1)
{\bf{Using input}} input("text") lets user input what they want for the variable% Row Count 9 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Data Types}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{int = integer \newline % Row Count 1 (+ 1)
float = decimal  \newline % Row Count 2 (+ 1)
str = strings (words, letters, symbols) \newline % Row Count 3 (+ 1)
{\bf{Python Math}} \newline % Row Count 4 (+ 1)
/  is for divide \newline % Row Count 5 (+ 1)
** exponent \newline % Row Count 6 (+ 1)
* multiply \newline % Row Count 7 (+ 1)
+ add \newline % Row Count 8 (+ 1)
- subtract \newline % Row Count 9 (+ 1)
Use \textbackslash{}" for double quotes in print statement \newline % Row Count 10 (+ 1)
\textbackslash{}t for tab \newline % Row Count 11 (+ 1)
\textbackslash{}n for line feed \newline % Row Count 12 (+ 1)
\textbackslash{}\textbackslash{} for backslash \newline % Row Count 13 (+ 1)
\# for comment% Row Count 14 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{IPO CHARTS}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{G}}ather input data \newline % Row Count 1 (+ 1)
{\bf{P}}rocess data \newline % Row Count 2 (+ 1)
{\bf{O}}utput data% Row Count 3 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{T and F}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{x = 4 \newline % Row Count 1 (+ 1)
y = 5 \newline % Row Count 2 (+ 1)
z = x \textgreater{} y \newline % Row Count 3 (+ 1)
print "The result of",x,"\textgreater{}",y,"is",z \newline % Row Count 4 (+ 1)
result : False% Row Count 5 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Calculating Totals}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/super-fly_1434333596_2015-06-14_21-59-12.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Functions and Libraries}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{int(\textless{}expr) convert to integer \newline % Row Count 1 (+ 1)
float(\textless{}expr\textgreater{} convert an expression to float \newline % Row Count 2 (+ 1)
abs(\textless{}expr\textgreater{}) return absolute value \newline % Row Count 3 (+ 1)
round(\textless{}expr\textgreater{}) round off expression \newline % Row Count 4 (+ 1)
pow(x,y) same as x**y \newline % Row Count 5 (+ 1)
math.sqrt(c\_sqrd) \newline % Row Count 6 (+ 1)
{\bf{Rounding off}} \newline % Row Count 7 (+ 1)
round(pi,2) = 3.14% Row Count 8 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}