From f6e5d4aeb32f8c14beb71865e66bcdae757fde88 Mon Sep 17 00:00:00 2001
From: Mattrixwv <m_ellison@ymail.com>
Date: Wed, 10 Jun 2020 00:59:50 -0400
Subject: [PATCH] Added program to teach different ways of formatting the same
 variables

---
 formatting.rs | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 formatting.rs

diff --git a/formatting.rs b/formatting.rs
new file mode 100644
index 0000000..df9f676
--- /dev/null
+++ b/formatting.rs
@@ -0,0 +1,52 @@
+use std::fmt::{self, Formatter, Display};
+
+struct City{
+	name: &'static str,
+	//Latitude
+	lat: f32,
+	//Longitude
+	lon: f32,
+}
+impl Display for City{
+	//`f` is a buffer, and this method must write the formatted string into it
+	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 { 'W' };
+
+		//`write!` is like `format!`, but it will write the formatted string
+		//into a buffer (the first argument)
+		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,
+}
+impl Display for Color{
+	fn fmt(&self, f: &mut Formatter) -> fmt::Result{
+		write!(f, "RGB ({0}, {1}, {2}) 0x{0:0width$X}{1:0width$X}{2:0width$X}", self.red, self.green, self.blue, width = 2)
+	}
+}
+
+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(){
+		//Switch this to use {} once you've added an implementation
+		//for fmt::Display.
+		//println!("{:?}", *color);
+		println!("{}", *color);
+	}
+}