You need only understand what even and odd are maths-wise for this. Here are some hints:
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int array[4][5] //This is a multidimensional array. It contains 4 sets of 5 elements.
//This is how to split up odds and evens:
if(n % 2 == 0)
{
//Then it is even.
}
else
{
//Then it is odd
}