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Groups > comp.lang.c > #168585
| From | Tim Rentsch <tr.17687@z991.linuxsc.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Increment/decrement a variable with a maximum |
| Date | 2022-12-18 16:41 -0800 |
| Organization | A noiseless patient Spider |
| Message-ID | <86a63k2pjp.fsf@linuxsc.com> (permalink) |
| References | <tno602$2cj2$1@dont-email.me> |
pozz <pozzugno@gmail.com> writes:
> Suppose you have two uint32_t variables (a and b) that you want to add
> together and another uint32_t variable (max) that is the maximum that
> the result could assume. A silly code could be:
>
> a += b;
> if (a > max) {
> a = max;
> }
>
> Of course, this doesn't work well for every values of a, b and max.
>
> For example, for a=0xFFFF'FFFC, b=10 and max=0xFFFF'FFFE.
>
>
> Could you suggest a better method? [...]
a = max > a && max - a > b ? a + b : max;
> And for decrement?
After seeing the expression for increment, exercise for the
reader.
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Increment/decrement a variable with a maximum pozz <pozzugno@gmail.com> - 2022-12-18 23:59 +0100
Re: Increment/decrement a variable with a maximum Siri Cruise <chine.bleu@yahoo.com> - 2022-12-18 15:07 -0800
Re: Increment/decrement a variable with a maximum Richard Damon <Richard@Damon-Family.org> - 2022-12-18 19:25 -0500
Re: Increment/decrement a variable with a maximum Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-12-18 16:41 -0800
Re: Increment/decrement a variable with a maximum antispam@math.uni.wroc.pl - 2022-12-19 14:39 +0000
Re: Increment/decrement a variable with a maximum Kaz Kylheku <864-117-4973@kylheku.com> - 2022-12-20 13:44 +0000
Re: Increment/decrement a variable with a maximum Kaz Kylheku <864-117-4973@kylheku.com> - 2022-12-20 13:54 +0000
Re: Increment/decrement a variable with a maximum Jame O' Brian <invalid@gmail.com> - 2022-12-20 18:12 +0000
Re: Increment/decrement a variable with a maximum Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2022-12-20 18:21 +0000
Re: Increment/decrement a variable with a maximum "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-12-20 12:52 -0800
Re: Increment/decrement a variable with a maximum Öö Tiib <ootiib@hot.ee> - 2022-12-23 05:21 -0800
Re: Increment/decrement a variable with a maximum "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-12-23 13:53 -0800
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