Check if at least two out of three booleans are true

Question

An interviewer recently asked me this question: given three boolean variables, a, b, and c, return true if at least two out of the three are true.

My solution follow

Answer 1

Another example of direct code:

int  n = 0;
if (a) n++;
if (b) n++;
if (c) n++;
return (n >= 2);

It's not the most succinct code, obviously.

Addendum

Another (slightly optimized) version of this:

int  n = -2;
if (a) n++;
if (b) n++;
if (c) n++;
return (n >= 0);

This might run slightly faster, assuming that the comparison against 0 will use faster (or perhaps less) code than the comparison against 2.