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## Re: Strange division using mixed integers and floats

**From**: |
Kevin Rodgers |

**Subject**: |
Re: Strange division using mixed integers and floats |

**Date**: |
Tue, 27 Apr 2004 09:46:30 -0600 |

**User-agent**: |
Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:0.9.4.1) Gecko/20020406 Netscape6/6.2.2 |

Johan Bockga*rd wrote:
> Ok, I know why this happens:
>
> (/ 5 4) => 1
>
> But this behaviour is *highly* confusing:
>
> (/ 5 4 2.3) => 0.4347826086956522
>
> Cf. (/ 5 4.0 2.3) => 0.5434782608695653
>
> At least there should be a warning in the manual.
*** elisp-manual-21-2.8/numbers.texi.orig Sat Sep 8 11:42:52 2001
--- elisp-manual-21-2.8/numbers.texi Tue Apr 27 09:45:26 2004
***************
*** 541,547 ****
divides @var{dividend} by each divisor in turn. Each argument may be a
number or a marker.
! If all the arguments are integers, then the result is an integer too.
This means the result has to be rounded. On most machines, the result
is rounded towards zero after each division, but some machines may round
differently with negative arguments. This is because the Lisp function
--- 541,548 ----
divides @var{dividend} by each divisor in turn. Each argument may be a
number or a marker.
! If both of the arguments are integers, then the result---the
! intermediate result, if there are additional arguments---is an integer too.
This means the result has to be rounded. On most machines, the result
is rounded towards zero after each division, but some machines may round
differently with negative arguments. This is because the Lisp function
--
Kevin Rodgers