Converting the output is too late; the calculation has already taken place in integer arithmetic. You need to convert the inputs to double: System.out.println((double)completed/(double)total); Note that you don’t actually need to convert both of the inputs. So long as one of them is double, the other will be implicitly converted. But I prefer to do … Read more
let v2 = vec![1; 10]; println!(“{:?}”, v2); {} is for strings and other values which can be displayed directly to the user. There’s no single way to show a vector to a user. The {:?} formatter can be used to debug it, and it will look like: [1, 1, 1, 1, 1, 1, 1, 1, … Read more
println is an built-in function (into the runtime) which may eventually be removed, while the fmt package is in the standard library, which will persist. See the spec on that topic. For language developers it is handy to have a println without dependencies, but the way to go is to use the fmt package or … Read more
This happens because Rust test programs hide the stdout of successful tests in order for the test output to be tidy. You can disable this behavior by passing the –nocapture option to the test binary or to cargo test (but, in this case after — – see below): #[test] fn test() { println!(“Hidden output”) } … Read more