Parse command-line arguments: Difference between revisions

=={{header|Rust}}==

<lang rust>use structopt::StructOpt;

#[derive(StructOpt)]

struct Opt {

#[structopt(short)]

b: bool,

#[structopt(short, required = false, default_value = "")]

s: String,

#[structopt(short, required = false, default_value = "0")]

n: i32,

}

fn main() {

let opt = Opt::from_args();

println!("b: {}", opt.b);

println!("s: {}", opt.s);

println!("n: {}", opt.n);

}</lang>

Examples:

<pre>

> parse

b: false

s:

n: 0

> parse -s bye -b

b: true

s: bye

n: 0

> parse -n 99 -s "say my name"

b: false

s: say my name

n: 99

</pre>