Signed overpunch

Signed overpunch

A signed overpunch is a code used to store the sign of a number by changing the last digit. It was used in old punched card systems and was carried over to COBOL especially when using EBCDIC. Its purpose is to save a character that would otherwise be used by the sign digit.cite web |url=http://www.3480-3590-data-conversion.com/article-signed-fields.html |title=Tech Talk, COBOL Tutorials, EBCDIC to ASCII Conversion of Signed Fields |accessdate=2008-03-15]

The codes

Examples

10} is -100
45A is 451

Decimal points are usually implied not explicit in the text. Using numbers with two decimal digits:

1000} is -100.00

References


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