class_14 - Software Engineering 3156 22-Oct-01 #14:...

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Software Engineering 3156 22-Oct-01 #14: Implementation Phil Gross
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2 Administrivia Webboard C’mon folks Homework 1 is here Homework 2 due tomorrow Note minor update Our server is dead
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3 Today’s class We’re ahead, so let’s keep on going Implementation basics
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4 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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5 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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6 Why COBOL? COBOL well-suited for data processing Supports large numbers, for example Report formatting capabilities Object-oriented COBOL? Yup
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7 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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8 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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9 Choosing a language What’s an appropriate language? Most programs and designs today are object-
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This note was uploaded on 06/09/2010 for the course COMS 3156 taught by Professor Philgross during the Fall '01 term at Columbia.

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class_14 - Software Engineering 3156 22-Oct-01 #14:...

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