What does the modulus operator mean in a C++ if statement?

[FallArk]

I have run into an if statement as shown below:

if (randoms[(x * 3) + y] % 2)

I don't really understand what this means.
Thank you for helping!

 

[MarkFL]

The [m]%[/m] symbol is the modulus operator, and so the expression [m]n % 2[/m] will be true if n is odd (there is a remainder when dividing by 2) and false if n is even (there is no remainder when dividing by 2).

So, the statement:

[m]if (randoms[(x * 3) + y] % 2)[/m]

Is looking to see if the [m]((x*3) + y)[/m]th element of the [m]randoms[/m] array is odd, and if so, execute some code.