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Excerpt from The Pl/I Programming Language
Fortran's rigid rules for program formatting. The notion of block structure was taken from Algol 60, while pl/i structures were taken from the record descriptions of Cobol. However, a great many features were added to pl/i that have no counter part in its ancestor languages.
An example of a pl/i program is given in Figure l. A program is written as a sequence of external procedures, which are defined in such a way that they can be compiled separately and then linked together when the program is executed. Within an external procedure, there can be internal procedures.
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