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add link to diagram of compiler phases
| url = http://www.diku.dk/hjemmesider/ansatte/torbenm/Basics/
| url = http://www.diku.dk/hjemmesider/ansatte/torbenm/Basics/
| title = Basics of Compiler Design
| title = Basics of Compiler Design
| accessdate = 2012-03-19}}</ref>, Professor Torben Mogensen identifies seven phases within a compiler, with the various phases being performed in one or more passes over the program.
| accessdate = 2012-03-19}}</ref>, Professor Torben Mogensen identifies seven phases within a compiler, with the various phases being performed in one or more passes over the program. A diagram illustrating these (and other) phases is shown on the last page of Professor Frank Pfenning's "Lecture Notes on Compiler Design: Overview"<ref>{{cite web
| url = http://www.cs.cmu.edu/~fp/courses/15411-f09/lectures/
| format = pdf
| title = Lecture Notes on Compiler Design: Overview
| accessdate = 2012-03-19}}</ref>
:'''Lexical analysis''': convert source code into sequence of tokens, such as variable names, keywords, numbers, and special symbols such as '+'.
:'''Lexical analysis''': convert source code into sequence of tokens, such as variable names, keywords, numbers, and special symbols such as '+'.