Hello world: a brief history of programming

A brief, selective and somewhat opinionated history of programming

Talk given at "An evening of unnecessary detail" at the Cambridge Science Festival 2018

Transcript

1. Hello world
   A brief
   history of
   programming
   @ben_nuttall
   

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2. Hello world
   A brief and selective
   history of
   programming
   @ben_nuttall
   

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3. Hello world
   A brief, selective and somewhat opinionated
   history of
   programming
   @ben_nuttall
   

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4. Programming language
   A formal definition of a set of rules for providing
   instructions to a computer.
   ~ Ben Nuttall, 2018
   

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5. History of programming languages
   Time Programming languages Notable people /
   organisations
   1840s – 1930s Machine language
   (mechanical instructions)
   Ada Lovelace
   Charles Babbage
   Alonzo Church
   1940s Assembly language John Mauchly
   1950s FORTRAN, LISP, COBOL Alick Glennie
   University of Manchester
   IBM
   Grace Hopper
   1960s B, APL, BASIC Bell Labs
   

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6. History of programming languages
   Time Programming languages Notable people /
   organisations
   1970s C, LOGO, Smalltalk, Prolog,
   SQL
   Dennis Ritchie, Seymour
   Papert
   1980s C++, MATLAB, Mathematica,
   Perl
   Bjarne Stroustrup, Larry Wall
   1990s Python, Ruby, Java,
   JavaScript, PHP
   Guido van Rossum, Yukihiro
   Matsumoto, Sun
   Microsystems, Brendan Eich,
   Rasmus Lerdorf
   2000s C#, Rust, Julia, Swift Microsoft, Apple, Mozilla, Viral
   Shah
   

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7. High-level programming languages
   High-level interpreted
   language
   Python Usually implemented in a low-
   level language
   Code executed directly
   High-level compiled
   language
   Java Usually implemented in a low-
   level language
   Code compiled into bytecode
   Low-level language C, C++, FORTRAN Compilers implemented in a
   low-level language (often the
   language itself)
   Assembly language Per specific computer architecture, e.g. Arm, Intel
   Machine language
   Hardware
   

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8. Raspberry Pi
   ●
   Series of single board
   computers designed for
   education and making
   ●
   Various models:
   – Cost $5 to $35
   ●
   Manufactured in Pencoed,
   Wales
   ●
   19M units sold to date
   

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9. Raspberry Pi Foundation
   ●
   Educational charity founded
   in 2009
   ●
   Based in Cambridge
   ●
   Aims to democratise
   computing
   ●
   Owns Raspberry Pi Trading
   Ltd, who make the
   Raspberry Pi computer
   

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10. Raspbian operating system
    ●
    Free Linux-based OS for
    Raspberry Pi
    ●
    Comes bundled with
    programming and
    educational tools
    ●
    Also available for your
    PC/Mac as “Raspberry Pi
    Desktop x86”
    

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11. "Hello world" programs
    ●
    The first program you write outputs the text "Hello world"
    

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12. 10 Hello world programs for your Raspberry Pi
    

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13. 1. Python
    print(“Hello world”)
    

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14. 2. Scratch
    

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15. 3. Ruby
    puts "Hello world"
    

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16. 3.5 Sonic Pi
    puts "Hello world"
    

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17. 4. Bash
    echo "Hello world"
    

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18. 5. Perl
    print "Hello world\n";
    

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19. 6. JavaScript
    console.log("Hello world")
    

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20. 7. Java
    public class Hello {
    public static void main(String[] args) {
    System.out.println("Hello world");
    }
    }
    

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21. 8. C
    #include
    int main() {
    printf("Hello world\n");
    }
    

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22. 9. C++
    #include
    int main() {
    std::cout << "Hello world\n";
    }
    

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23. 10. Minecraft (Python)
    from mcpi.minecraft import Minecraft
    mc = Minecraft.create()
    mc.postToChat("Hello world")
    

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24. 10. Minecraft (Python)
    

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25. 10.5 Sense HAT Emulator (Python)
    from sense_emu import SenseHat
    sense = SenseHat()
    sense.show_message("Hello world")
    

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26. 10.5 Sense HAT Emulator (Python)
    

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27. Langauge Print command Compiled? Implementation
    Scratch say Interpreted Smalltalk (V1) /
    ActionScript (V2)
    Python print Interpreted C (and others, including
    Python)
    Ruby puts Interpreted C
    JavaScript console.log Interpreted C++
    Bash echo Interpreted C
    Perl print Interpreted C
    Java System.out.println Compiled C++ (JVM)
    C printf Compiled C / C++
    C++ cout Compiled C / C++
    

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28. Say "Hello world" back
    ●
    Find my article "10 Hello world programs for your Raspberry
    Pi" on opensource.com
    ●
    Find my GitHub repository of these programs and more at
    github.com/bennuttall/hello-world-raspberry-pi
    ●
    Contribute your own programs and suggestions!
    

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29. print("Goodbye world")
    Thank you
    @ben_nuttall
    

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