Modules
pub mod calculator;is a Rust code snippet that declares a module namedcalculatorand makes it public (pub). This means that the contents of thecalculatormodule can be accessed from outside the current module or crate.
pub mod calculator; is a Rust code snippet that declares a module named calculator and makes it
public (pub). This means that the contents of the calculator module can be accessed from outside
the current module or crate.