two's complement done before storage or on the fly while computing

G

Greenhorn

Hi,
Is two's complement always used as a storage method or is it computed
while computing the expression involved.
e.g., int a = -2, b = 3, c = 4, d;
d = b - c;

Here, is always 'a' stored as two's complement of '2'?
or
is always '-c' (two's complement of c) computed on the fly and the
resulting value is added to b ( b + (-c))?

Joe
 

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