Attachment 7133 Details for Bug 15799 – More examples (3 types of division, plus exact quotient and zero)

More examples (3 types of division, plus exact quotient and zero)

file_15799.txt (text/plain), 1021 bytes, created by Guilliam Xavier on 2013-08-01 07:43:32 UTC

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Creator: Guilliam Xavier

Created: 2013-08-01 07:43:32 UTC

Size: 1021 bytes

patch

obsolete

>Common types of integer division:
>
>  T: Truncated (the quotient is truncated toward 0)
>  F: Floored   (the quotient is floored toward -infinity)
>  E: Euclidean (the remainder is always positive)
>
>C89 requires Truncated semantics for div(), but not for / and %.
>C99 and newer require Truncated semantics for / and % (and for div() too).
>
>             T     F     E
>
> 33 /  5     6     6     6
> 33 %  5     3     3     3
> 
>-33 /  5    -6    -7    -7
>-33 %  5    -3     2     2
> 
> 33 / -5    -6    -7    -6
> 33 % -5     3    -2     3
> 
>-33 / -5     6     6     7
>-33 % -5    -3    -3     2
>
>             T     F     E
>
> 30 /  5     6     6     6
> 30 %  5     0     0     0
> 
>-30 /  5    -6    -6    -6
>-30 %  5     0     0     0
> 
> 30 / -5    -6    -6    -6
> 30 % -5     0     0     0
> 
>-30 / -5     6     6     6
>-30 % -5     0     0     0
>
>             T     F     E
>
>  0 /  5     0     0     0
>  0 %  5     0     0     0
> 
>  0 / -5     0     0     0
>  0 % -5     0     0     0

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