We use the %= (remainder) assignment gives us the remainder from a division operation. For example, dividing 9 by 2 results in 2 going into 9 four times with a remainder of 1. That 1 is what the %= will give us.
%=
9
2
1
fn main() { let mut alfa = 9; alfa %= 2; println!("alfa is {}", alfa); }
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