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I got this c++ macro and wonder what they mean by code%2 (the percentage sign) ?
#define SHUFFLE_STATEMENT_2(code, A, B)
switch (code%2)
{
case 0 : A; B; break;
case 1 : B; A; break;
}
It is for taking a modulus.
Basically, it is an integer representation of the remainder.
So, if you divide by 2 you will have either 0 or 1 as a remainder.
This is a nice way to loop through numbers and if you want the even rows to be one color and the odd rows to be another, modulus 2 works well for an arbitrary number of rows.