RBE primitives tuples activity 1

rustbyexample/primitives/primitives_tuples.rs

@@ -1,3 +1,5 @@
+use std::fmt;
+
 fn reverse(pair: (i32, bool)) -> (bool, i32) {
     let (integer, boolean) = pair;
     (boolean, integer)
@@ -6,6 +8,12 @@ fn reverse(pair: (i32, bool)) -> (bool, i32) {
 #[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,
@@ -33,4 +41,5 @@ fn main() {
 
     let matrix = Matrix(1.1, 1.2, 2.1, 2.2);
     println!("{:?}", matrix);
+    println!("{}", matrix);
 }