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Lesson 1:Introduction to Programming (Python/Java)

Lesson 1:Introduction to Programming (Python/Java). Computer Science 1 Mr. Bernstein. Hardware Vs Software. What’s the difference? Hardware : Software :. Some Examples. Hardware: Software:. The problem with Binary… Machine Code to the Rescue!.

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Lesson 1:Introduction to Programming (Python/Java)

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  1. Lesson 1:Introduction to Programming (Python/Java) Computer Science 1 Mr. Bernstein

  2. Hardware Vs Software • What’s the difference? • Hardware: • Software:

  3. Some Examples • Hardware: • Software:

  4. The problem with Binary…Machine Code to the Rescue! • As simple as Binary is, it’s very difficult for Hardware to use • Instead…Hardware uses Machine Code - which translates into binary

  5. The problem with Machine Code…Programming Languages to the Rescue! • Ok, so Machine code is understood by hardware… • But very difficult for humans to understand and write… • So programming languages were created (semi-English) that translate into Machine Code! • ZOMG!, now, code-monkeys like u and me can tell hardware what to do without having to learn Machine Code or Binary!!!

  6. Quick History of Programming • 1950s – Chaos Grammin! • No real structure  very buggy and expensive • Cheaper to do stuff by hand(less expensive) • Not dependable  locked away in big rooms with AC and lots of programmers to make sure they worked • 1960-1975 – Functional Grammin ! • Allowed programmers to create functions • Can write Bigger Programs Faster • Still difficult to find bugs • Example : Fortran

  7. Quick History of Programming (continued) • 1975-1990 – Structured Grammin ! • Programmers finally figured out that they needed a lang that would be easier to debug • Instead of having random bits of info flying everywhere they structured it such that all data about a certain thing was all in one place. • So like, 4Eg, all info for a Car (year,color,model) would be stored in one place • If something went wrong with the car data, the grammers would know where to go • Example : C

  8. Quick History of Programming (continued) • 1990-present – OOP !(no it’s not the singular form of oops, it’s object oriented programming ) • Expanded the concept of Structured Programming into something called a class • Instead of just storing data, this class can actually do certain actions. 4Eg: A car can accelerate, break, turn, honk etc. • Ex: C++ , Java, Python, Pascal

  9. Some Terms • Source Code • The Source Code is the actual code the programmer writes – Our source code will be in Python and Java • Interpreter • A software program converts the source code to object code • Will only do so if there are no language errors in the source code • Executable file • A software program that executes the commands you wrote in your source code

  10. How Python/Java Works • Programmer types Source Code • Programmer runs Source code through a Compiler • Compiler/Interpreter checks for errors, if none, will produce Object Code • Programmer will run Object Code Through a Linker • Linker will create an Executable • Programmer can now run the Executable Software!

  11. Python – Snake or Circus? • Python comes from Monty Python • Python has a lot of hidden references from Monty Python Flying Circus • http://youtu.be/zP0sqRMzkwo

  12. Warmup from yesterdayHow does Python Work ?

  13. Summary • Not too long ago software was not that dependable • Went from Chaos, to Functional, to Structured to OOP • OOP is soo hott now. Now almost everything we do depends on reliable software. • Java/Python is a lang that uses OOP • SrcCodeinterpreterObjectCodeLinker Executable

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