docs(tutorial): Provide better default_value_t example

examples/tutorial_builder/03_05_default_values.md

@@ -2,19 +2,19 @@
 $ 03_05_default_values --help
 A simple to use, efficient, and full-featured Command Line Argument Parser
 
-Usage: 03_05_default_values[EXE] [NAME]
+Usage: 03_05_default_values[EXE] [PORT]
 
 Arguments:
-  [NAME]  [default: alice]
+  [PORT]  [default: 2020]
 
 Options:
   -h, --help     Print help information
   -V, --version  Print version information
 
 $ 03_05_default_values
-name: "alice"
+port: 2020
 
-$ 03_05_default_values bob
-name: "bob"
+$ 03_05_default_values 22
+port: 22
 
 ```

examples/tutorial_builder/03_05_default_values.rs

@@ -1,14 +1,18 @@
-use clap::{arg, command};
+use clap::{arg, command, value_parser};
 
 fn main() {
     let matches = command!() // requires `cargo` feature
-        .arg(arg!([NAME]).default_value("alice"))
+        .arg(
+            arg!([PORT])
+                .value_parser(value_parser!(u16))
+                .default_value("2020"),
+        )
         .get_matches();
 
     println!(
-        "name: {:?}",
+        "port: {:?}",
         matches
-            .get_one::<String>("NAME")
+            .get_one::<u16>("PORT")
             .expect("default ensures there is always a value")
     );
 }

examples/tutorial_derive/03_05_default_values.md

@@ -2,19 +2,19 @@
 $ 03_05_default_values_derive --help
 A simple to use, efficient, and full-featured Command Line Argument Parser
 
-Usage: 03_05_default_values_derive[EXE] [NAME]
+Usage: 03_05_default_values_derive[EXE] [PORT]
 
 Arguments:
-  [NAME]  [default: alice]
+  [PORT]  [default: 2020]
 
 Options:
   -h, --help     Print help information
   -V, --version  Print version information
 
 $ 03_05_default_values_derive
-name: "alice"
+port: 2020
 
-$ 03_05_default_values_derive bob
-name: "bob"
+$ 03_05_default_values_derive 22
+port: 22
 
 ```

examples/tutorial_derive/03_05_default_values.rs

@@ -3,12 +3,12 @@ use clap::Parser;
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
 struct Cli {
-    #[arg(default_value_t = String::from("alice"))]
-    name: String,
+    #[arg(default_value_t = 2020)]
+    port: u16,
 }
 
 fn main() {
     let cli = Cli::parse();
 
-    println!("name: {:?}", cli.name);
+    println!("port: {:?}", cli.port);
 }