Filling in 1.2.3

rustbyexample/0123/src/main.rs

@@ -0,0 +1,42 @@
+use std::fmt::{self, Formatter, Display};
+
+struct City {
+    name: &'static str,
+    lat: f32,
+    lon: f32,
+}
+
+impl Display for City {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        let lat_c = if self.lat >= 0.0 { 'N' } else { 'S' };
+        let lon_c = if self.lon >= 0.0 { 'E' } else { 'S' };
+
+        write!(f, "{}: {:.3}˚{} {:.3}˚{}",
+               self.name, self.lat.abs(), lat_c, self.lon.abs(), lon_c)
+    }
+}
+
+#[derive(Debug)]
+struct Color {
+    red: u8,
+    green: u8,
+    blue: u8,
+}
+
+fn main() {
+    for city in [
+        City { name: "Dublin", lat: 53.347778, lon: -6.259722 },
+        City { name: "Oslo", lat: 59.95, lon: 10.75 },
+        City { name: "Vancouver", lat: 49.25, lon: -123.1 },
+    ].iter() {
+        println!("{}", *city);
+    }
+
+    for color in [
+        Color { red: 128, green: 255, blue: 90 },
+        Color { red: 0, green: 3, blue: 254 },
+        Color { red: 0, green: 0, blue: 0 },
+    ].iter() {
+        println!("{:?}", *color);
+    }
+}