a dash before variable

Question

I'm trying to make a VST Plugin and I saw a dash before a variable like this:

*output = fmax(*input,-mTreshhold);

I've searched in google but I couldn't find anything about it. Can someone explain what that dash does?

Please read one of the books in the introductory section [here](http://stackoverflow.com/q/388242/2069064). They will help you a lot more at this time than SO. — Barry, May 21 '16 at 18:02

score 2 · Accepted Answer · answered May 21 '16 at 17:59

2

Feels kind of obvious since I had math in school: it's just the negative sign. fmax is called with 0-mThreshold as second parameter.

answered May 21 '16 at 17:59

Marcus Müller

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score 1 · Answer 2 · answered May 21 '16 at 18:00

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It's a unary minus operator, which is an arithmetic operator. It calculates the negative of its operand. For unsigned a, the value of -a is 2^b -a, where b is the number of bits after promotion.

More information about all arithmetic operators here.

answered May 21 '16 at 18:00

Leandros

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score 0 · Answer 3 · answered May 21 '16 at 18:00

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The dash symbol before a variable or numeric constant negates the value.

The equivalent expression is:

*output = fmax(*input, 0 - mThreshhold);

answered May 21 '16 at 18:00

Thomas Matthews

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a dash before variable

3 Answers3