Understanding FORTRAN 77's column-oriented format: A retrospective on punched card programming
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Tags: fortran Programming
The kind of bagel that ruins lesser bagels for you.
Summary
A nostalgic retrospective on learning FORTRAN 77 as an undergraduate physics student, explaining the historical context of the language's column-oriented format inherited from punched cards. The article details how FORTRAN's strict column rules (columns 1-5 for statement numbers, column 6 for continuation, columns 7-72 for code, columns 73-80 ignored) originated from 80-column punched cards, and discusses the practical experience of writing programs in this constrained format.
Key quotes
· 3 pulledWhen I was an undergraduate physics student, everyone in my program had to learn how to write programs in FORTRAN 77.
Old-style FORTRAN uses a particular column-oriented format. This dates back to the original FORTRAN, which was written on punched cards that stored only 80 columns of data.
To make the most of this format, FORTRAN applied a strict column rule.
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