rust get application version code example

Example: rust get crate version

const VERSION: &'static str = env!("CARGO_PKG_VERSION");
const OPTION_VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");

// ...

println!("MyProgram v{}", VERSION);
println!("MyProgram v{}", OPTION_VERSION.unwrap_or("unknown"));