The modulo instruction is an arithmetic instruction using the % character.

It is used like other arithmetic instructions such as + and -

It returns the remainder, after division by a certain number.

This divides 5 by 2, which can be divided twice with a remainder of 1.

This is not really used much, but it is used in lots of programming challenges. Particularly, we can use it to test if something is divisible.

A number can be evenly divided by another number if there is no remainder.

is_four_even = (4 % 2 == 0)

or the more general function