println!("{}", 9.4 * 3.0)

[chedongzhe]

println!("{}", 9.4 * 3.0);
output: 28.200000000000003

[snowfoxsh]

That is the expected output. https://docs.python.org/3/tutorial/floatingpoint.html. This is just an issue with how floating point numbers in general work.

[LunarLambda]

Maybe you are looking for the precision field:

println!("{:.2}", 9.3 * 3.0);

will print 27.90.

[cuviper]

Float Exposed is also a useful reference, as it will show you that the closest f64 (double) to 9.4 is 9.40000000000000035527 -- and even that is an approximation, but you can find the exact base-10 number later on the page. So you're starting with a higher input than you wanted, and then the multiplication result comes out higher than you wanted too.

On the other hand, 3.0 is exact.

[fmease]

Closing as works-as-intended.