4 /*Computes the gcd of two integers, _a and _b.
5 _a: The first integer of which to compute the gcd.
6 _b: The second integer of which to compute the gcd.
7 Return: The non-negative gcd of _a and _b.
8 If _a and _b are both 0, then 0 is returned, though in reality the
9 gcd is undefined, as any integer, no matter how large, will divide 0
11 int gcd(int _a,int _b);