Re: !!, what is it?

bjk of course ha scritto: 
hello,

I've stumbled upon this in some code:

n = !!x;

I've ran it and 'n' is always either 0 or 1. Is '!!' an operator (what's it
called?) and is it standard/portable?


It means 'not not x', evaluating to 0 if x is 0 or to 1 if x is not 0.

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