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51 lines
1.2 KiB
51 lines
1.2 KiB
use std::fmt::{self, Formatter, Display};
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struct City {
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name: &'static str,
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lat: f32,
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lon: f32,
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}
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impl Display for City {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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let lat_c = if self.lat >= 0.0 { 'N' } else { 'S' };
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let lon_c = if self.lon >= 0.0 { 'E' } else { 'S' };
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write!(f, "{}: {:.3}˚{} {:.3}˚{}",
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self.name, self.lat.abs(), lat_c, self.lon.abs(), lon_c)
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}
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}
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#[derive(Debug)]
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struct Color {
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red: u8,
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green: u8,
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blue: u8,
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}
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impl Display for Color {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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write!(f, "RGB ({}, {}, {}) 0x{:02X}{:02X}{:02X}", self.red, self.green, self.blue, self.red, self.green, self.blue)
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}
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}
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fn main() {
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for city in [
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City { name: "Dublin", lat: 53.347778, lon: -6.259722 },
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City { name: "Oslo", lat: 59.95, lon: 10.75 },
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City { name: "Vancouver", lat: 49.25, lon: -123.1 },
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].iter() {
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println!("{}", *city);
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}
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for color in [
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Color { red: 128, green: 255, blue: 90 },
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Color { red: 0, green: 3, blue: 254 },
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Color { red: 0, green: 0, blue: 0 },
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].iter() {
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println!("{:?}", *color);
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println!("{}", *color);
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}
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}
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