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The Computer Journal 1996 39(3):203-214; doi:10.1093/comjnl/39.3.203
© 1996 by British Computer Society
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A Formal Basis For Removing Goto Statements

S. Pan * and R. G. Dromey *

Software Quality Institute, Griffith University, Brisbane, QLD, 4111, Australia

Goto statements detract from the quality of imperative programs. They tend to make control-structures difficult to understand and, at the same time, introduce the risk of non-termination and other correctness problems. A new, formal, generally applicable procedure for removing all goto statements from program structures is presented. This method is based on formal semantics and congruent equivalence transformations. Not only does the method logically simplify program structures; it also detects a range of defects including a class of non-termination problems, unreachable code and redundancy problems. The method can also be used to eliminate recursion.

Received March 29, 1994. revised March 20, 1996.

* Software Quality Institute, Griffith University, Brisbane, QLD. 4111, Australia Email: G.Dromey{at}cit.gu.edu.au


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