2.2 with activity

rustbyexample/022/Cargo.lock

@@ -0,0 +1,4 @@
+[root]
+name = "022"
+version = "0.1.0"
+

rustbyexample/022/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "022"
+version = "0.1.0"
+authors = ["Dan Buch <daniel.buch@gmail.com>"]
+
+[dependencies]

rustbyexample/022/src/main.rs

@@ -0,0 +1,54 @@
+use std::fmt;
+
+fn reverse(pair: (i32, bool)) -> (bool, i32) {
+    let (integer, boolean) = pair;
+    (boolean, integer)
+}
+
+fn transpose(matrix: Matrix) -> Matrix {
+    Matrix(matrix.0, matrix.2, matrix.1, matrix.3)
+}
+
+#[derive(Debug)]
+struct Matrix(f32, f32, f32, f32);
+
+impl fmt::Display for Matrix {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "( {} {} )\n( {} {} )", self.0, self.1, self.2, self.3)
+    }
+}
+
+fn main() {
+    let long_tuple = (1u8, 2u16, 3u32, 4u64,
+                      -1i8, -2i16, -3i32, -4i64,
+                      0.1f32, 0.2f64,
+                      'a', true);
+
+    println!("long tuple first value: {}", long_tuple.0);
+    println!("long tuple second value: {}", long_tuple.1);
+
+    let tuple_of_tuples = ((1u8, 2u16, 2u32), (4u64, -1i8), -2i16);
+
+    println!("tuple of tuples: {:?}", tuple_of_tuples);
+
+    let pair = (1, true);
+    println!("pair is {:?}", pair);
+
+    println!("the reversed pair is {:?}", reverse(pair));
+
+    println!("one element tuple: {:?}", (5u32,));
+    println!("just an integer: {:?}", (5u32));
+
+    let tuple = (1, "hello", 4.5, true);
+
+    let (a, b, c, d) = tuple;
+    println!("{:?}, {:?}, {:?}, {:?}", a, b, c, d);
+
+    let matrix = Matrix(1.1, 1.2, 2.1, 2.2);
+    println!("{:?}", matrix);
+
+    println!("{}", matrix);
+
+    println!("Matrix:\n{}", matrix);
+    println!("Transpose:\n{}", transpose(matrix));
+}