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very simple

hunkeelin (159)
what is
n = (n<0) ? -n : n;
means?
Bazzy (6281)
It's the conditional operator
it means
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if ( n < 0 )
    n = -n;
else
    n = n;


http://www.cplusplus.com/doc/tutorial/operators/
moorecm (1932)
In mathematics, it means: n = |n|
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