Need help for if condition with tolerance

Programming Questions

at221at221

Need help for if condition with tolerance

in Programming Questions • 3 years ago

Hi,

I have a problem where I am trying to writing an if conditioning statement:

float a, b;

if (a == b) {

then do something...

}

What I really want is to allow some kind of tolerance so that "a" can be +/- some tolerance of "b". Not exactly equal.

Thanks

Replies(8)

blindfish

Re: Need help for if condition with tolerance

3 years ago

What might be presenting you with a problem is how to deal with positive as well as negative variations. In that case you might find abs() useful... Then you an subtract one value from another and check whether the absolute value is within your threshold.

guy_yitzh..

Re: Need help for if condition with tolerance

3 years ago

I think this should do the trick

float tolerance = some value;
if (abs(a-b) <= tolerance) {
do stuff
}

EDIT - oops i didn't notice blindfish already answered...

at221at221

Re: Need help for if condition with tolerance

3 years ago

thanks for the fast useful responses

blindfish

Re: Re: Need help for if condition with tolerance

3 years ago

Did you really mean "useless"? Because in that case - apart from being downright rude - you might want to explain how our responses don't address your needs: they certainly do what you originally asked for...

jeff_g

Re: Need help for if condition with tolerance

3 years ago

at221at221, not a great way to get future help by describing others attempt to help you as "useless", particularly when they appear to have answered your question accurately and politely. Perhaps you mistyped?

at221at221

Re: Need help for if condition with tolerance

3 years ago

sry i had a mind lapse i meant useful :D

blindfish

Re: Re: Need help for if condition with tolerance

3 years ago

:D
Well at least you've owned up to it. I'm rather amused. Glad that the info was in fact useful ;)

guy_yitzh..

Re: Need help for if condition with tolerance

3 years ago

it was too rude to be true :)

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