Can't parse String from stdin to floating-point - Rust

Question

When parsing a String type value to a floating-point type value in Rust, everything works fine with
\"let pi: f64 = 3.14\".parse().unwrap();.

However,

Answer 1

Much thanks to Jeff Muizelaar and SCappella!

SCappella pointed out that there is a newline character causing the type conversion to fail, and Jeff Muizelaar pointed out that adding a trim() method to the String, "s," would remove the newline, resolving the issue.

After realizing that was the issue, I was able to do some more accurate Googling and found this bit of Rust documentation. It explains that the read_line() method

"read[s] all bytes until a newline (the 0xA byte) is reached...Once found, all bytes up to, and including, the delimiter (if found) will be appended..."