An Introduction to the PL/CV2 Programming Logic by R. L. Constable

By R. L. Constable

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In those languages, a string of digit characters is a character-string, not a number, and we would need to convert it into the number it looks like before we could use it as a number. Perl is more easygoing. A final point about (8) has to do with error-trapping. In connexion with die we saw that it is wise not to make too many assumptions about external files being as they ideally should be. 1 (so that the die instruction is not activated), there could easily be unpleasant surprises within its contents.

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In other words, the fourth and fifth lines of the output file will be in the form: 294,000 1,472,000 Cambridgeshire_and_Isle_of_Ely Cheshire We will make no assumptions about how whitespace is used in the input file; in the output file there will be no leading or trailing whitespace, and populations will be separated from county names by a single tab. Any wholly-blank lines in the input will be eliminated, so the new file will contain one line per county. Please click the advert This will show us how Perl programs create and write output to external files.

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