Question : rust attempt to multiply with overflow
Answered by : huldar
/*
For the value to be u8, all operands of the expression need to be u8 as well.
The expression 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 doesn’t fit into a u8
which is why the compiler complains.
It works if you write it like this:
*/
fn main() { let x: u8 = (2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 - 1) as u8; println!("{}", x);
}
/*
This way the 2s and the 1 will be 64 or 32 bit integers and
the final result is then converted into u8.
You can also just use a bigger type like i32 or i64.
*/Source : https://users.rust-lang.org/t/error-attempt-to-multiply-with-overflow/23304 | Last Update : Thu, 08 Apr 21