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


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Punched card — Overpunch redirects here. For the code, see Signed overpunch. A punched card, punch card, IBM card, or Hollerith card is a piece of stiff paper that contains digital information represented by the presence or absence of holes in predefined… …   Wikipedia

  • Binary-coded decimal — In computing and electronic systems, binary coded decimal (BCD) is a digital encoding method for numbers using decimal notation, with each decimal digit represented by its own binary sequence. In BCD, a numeral is usually represented by four bits …   Wikipedia

  • COBOL — For other uses, see COBOL (disambiguation). COBOL LANGUAGE Paradigm(s) procedural, object oriented Appeared in 1959 (1959) Designed by Grace Hopper, William Selden, Gertrude Tierney, Howard Bromberg, Howard Discount, Vernon Reeves, Jean E.… …   Wikipedia

  • Burroughs large systems instruction set — The B5000 instruction set is the set of valid operations for the Burroughs large systems including the current (as of 2006) Unisys Clearpath/MCP systems. These unique machines have a distinctive design and instruction set. Each word of data is… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”