16 May 1999 14:12:23 -0400

Related articles |
---|

Rounding with Div and Mod operators william.rayer@virgin.net (William Rayer) (1999-05-09) |

Re: Rounding with Div and Mod operators wclodius@aol.com (1999-05-16) |

Re: Rounding with Div and Mod operators ucapjab@ucl.ac.uk (Jonathan Barker) (1999-05-16) |

Re: Rounding with Div and Mod operators nr@labrador.cs.virginia.edu (Norman Ramsey) (1999-05-16) |

Re: Rounding with Div and Mod operators guerby@acm.org (Laurent Guerby) (1999-05-16) |

Re: Rounding with Div and Mod operators anton@mips.complang.tuwien.ac.at (1999-05-16) |

Re: Rounding with Div and Mod operators Scott.Daniels@Acm.Org (Scott.David.Daniels) (1999-05-16) |

Re: Rounding with Div and Mod operators cdg@nullstone.com (Christopher Glaeser) (1999-05-16) |

Re: Rounding with Div and Mod operators johan.persson@mbox319.swipnet.se (Johan Persson) (1999-05-16) |

Re: Rounding with Div and Mod operators genew@shuswap.net (1999-05-20) |

[10 later articles] |

From: | Norman Ramsey <nr@labrador.cs.virginia.edu> |

Newsgroups: | comp.compilers |

Date: | 16 May 1999 14:12:23 -0400 |

Organization: | University of Virginia Computer Science |

References: | 99-05-039 |

Keywords: | arithmetic, design, comment |

William Rayer <william.rayer@virgin.net> wrote:

*>What is interesting about this rule is there seem to be two ways of*

*>rounding that satisfy it when n or d are negative - either we round*

*>integers to the next lowest value or we round towards zero.*

Some years ago, Knuth wrote a short screed arguing why round toward

minus infinity is better than round towards zero. It might even be in

Volume 2. You might also check the Modula-3 definition for arguments

about why the desginers of that lagnuages chose round towards minus

infinity.

If anybody can actually find the Knuth reference, I'd like to hear

about it --- I seem to wind up producing it once a year, adn I'd love

to give people a more precise pointer.

Norman

[I looked, if it's in Vol 2, it's well hidden. -John]

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