File: 03_05_default_values.rs

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use clap::Parser;

#[derive(Parser)]
#[command(version, about, long_about = None)]
struct Cli {
    #[arg(default_value_t = 2020)]
    port: u16,
}

fn main() {
    let cli = Cli::parse();

    println!("port: {:?}", cli.port);
}