Completed 1.2.2 bits

rustbyexample/0122/Cargo.lock

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+[root]
+name = "0122"
+version = "0.1.0"
+

rustbyexample/0122/Cargo.toml

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+[package]
+name = "0122"
+version = "0.1.0"
+authors = ["Dan Buch <daniel.buch@gmail.com>"]
+
+[dependencies]

rustbyexample/0122/src/main.rs

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+use std::fmt;
+
+#[derive(Debug)]
+struct MinMax(i64, i64);
+
+impl fmt::Display for MinMax {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "({}, {})", self.0, self.1)
+    }
+}
+
+#[derive(Debug)]
+struct Point2 {
+    x: f64,
+    y: f64,
+}
+
+impl fmt::Display for Point2 {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "x: {}, y: {}", self.x, self.y)
+    }
+}
+
+fn main() {
+    let minmax = MinMax(0, 14);
+
+    println!("Compare structures:");
+    println!("Display: {}", minmax);
+    println!("Debug: {:?}", minmax);
+
+    let big_range = MinMax(-300, 300);
+    let small_range = MinMax(-3, 3);
+
+    println!("The big range is {big} and the small range is {small}",
+             small=small_range,
+             big=big_range);
+
+    let point = Point2 { x: 3.3, y: 7.2 };
+
+    println!("Compare points:");
+    println!("Display: {}", point);
+    println!("Debug: {:?}", point);
+}

rustbyexample/0122/src/structure.rs

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+use std::fmt;
+
+struct Structure(i32);
+
+impl fmt::Display for Structure {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0);
+    }
+}