3156-13 - COMS W3156: Software Engineering, Fall 2001...

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COMS W3156: Software Engineering, Fall 2001 Lecture #13: Implementation I Janak J Parekh janak@cs.columbia.edu
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Administrativia JDOM should now be installed on CUNIX Look in ~cs3156/jdom and the webboard HW2 due next Tuesday
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Next class Continue implementation: Testing Concurrent architectures and event models Input on concurrent architectures
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Today’s class We’re ahead, so let’s keep on going Implementation basics
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Choosing a programming language Note that this is occurring at the implementation phase; in reality may sometimes occur earlier, but you want the design to be mostly language-independent Consider cost of retraining What if we asked you all to do this in C++? Mutiny, right?
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Historically… Most software was written in COBOL Currently, more COBOL code exists than anything else Approved by DoD in 1960: insisted any applications they would buy had to be in COBOL
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Why COBOL? COBOL well-suited for data processing Supports large numbers, for example Report formatting capabilities Object-oriented COBOL? Yup
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Levels of languages Lowest: machine code 000010100111110101110100000111001010 Next: assembly mov $17, next Next: non-interpreted procedural languages C, C++, Objective C, COBOL, FORTRAN Interpreted procedural languages Java, Smalltalk, Perl, Python, Tcl, Ruby, LISP
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Going on up 4 th -generation languages Javascript, SQL Loose typing (a = 5; a = “foo”;) Less strict error-checking Not necessarily procedural Objective often end-user programming Unsurprisingly, controversial Success stories abound, however
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3156-13 - COMS W3156: Software Engineering, Fall 2001...

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