Ex 3.1

rustbyexample/031/Cargo.lock

@@ -0,0 +1,4 @@
+[root]
+name = "031"
+version = "0.1.0"
+

rustbyexample/031/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "031"
+version = "0.1.0"
+authors = ["Dan Buch <daniel.buch@gmail.com>"]
+
+[dependencies]

rustbyexample/031/src/main.rs

@@ -0,0 +1,37 @@
+struct Nil;
+
+struct Pair(i32, f32);
+
+struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[allow(dead_code)]
+struct Rectangle {
+    p1: Point,
+    p2: Point,
+}
+
+fn main() {
+    let point: Point = Point { x: 0.3, y: 0.4 };
+
+    println!("point coordinates: ({}, {})", point.x, point.y);
+
+    let Point { x: my_x, y: my_y } = point;
+
+    let _rectangle = Rectangle {
+        p1: Point { x: my_y, y: my_x },
+        p2: point,
+    };
+
+    let _nil = Nil;
+
+    let pair = Pair(1, 0.1);
+
+    println!("pair contains {:?} and {:?}", pair.0, pair.1);
+
+    let Pair(integer, decimal) = pair;
+
+    println!("pair contains {:?} and {:?}", integer, decimal);
+}