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| author | Mattias Andrée <maandree@kth.se> | 2016-03-05 16:36:56 +0100 |
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| committer | Mattias Andrée <maandree@kth.se> | 2016-03-05 16:37:07 +0100 |
| commit | 8237156ffb390b38c55863d1b14f246af8a1c19c (patch) | |
| tree | fc631b36bbcbb14b21b4a6e56cdfe8ca595f3e3b /man/zmod.3 | |
| parent | Makefile: add check rule (diff) | |
| download | libzahl-8237156ffb390b38c55863d1b14f246af8a1c19c.tar.gz libzahl-8237156ffb390b38c55863d1b14f246af8a1c19c.tar.bz2 libzahl-8237156ffb390b38c55863d1b14f246af8a1c19c.tar.xz | |
More detailed description of division and modulus
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to 'man/zmod.3')
| -rw-r--r-- | man/zmod.3 | 13 |
1 files changed, 12 insertions, 1 deletions
@@ -24,11 +24,22 @@ Mod .P The result .RI ( remainder ) -is always non-negative. +is always non-negative. To be more precise, +a Mod b = |a| Mod |b| for all integers a +and b. .P It is safe to call .B zmod with non-unique parameters. +.SH RATIONALE +There are many ways to define modulus with +negative integers. You have to select how the +signness is selected, and when to invert +(in respect to modulated addition) the remainder. +The simplest way to implement modulus is to +ignore the sign of the operands. This solution +also makes it very easy for those that which +to write a wrapper that changes the definition. .SH SEE ALSO .BR zdivmod (3), .BR zstr (3), |