This paper examines the concept of comments in programming languages and answers the questions: Why are they needed? How are they defined and implemented in existing languages? What should be provided in future languages?
An insidious mistake in Fortran is to misspell a symbolic name and thus inadvertently create a new variable. This short note shows how the IMPLICIT statement can be used to detect this mistake easily.
Every computer system seems to have a different method of editing files. This survey considers the tasks, constraints and user interface for computer editors. Several editors are examined and reviewed. This paper also contains a glossary of some terms connected with editing and includes a reference to other surveys and bibliographies.
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