Much renaming and refreshing of RBE

rustbyexample/hello.d/print.d/print_display2.rs

@@ -0,0 +1,66 @@
+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 Point2D {
+    x: f64,
+    y: f64,
+}
+
+impl fmt::Display for Point2D {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "x: {}, y: {}", self.x, self.y)
+    }
+}
+
+#[derive(Debug)]
+struct Complex {
+    real: f64,
+    imag: f64,
+}
+
+impl fmt::Display for Complex {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{} + {}i", self.real, self.imag)
+    }
+}
+
+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 is {small}",
+        small = small_range,
+        big = big_range
+    );
+
+    let point = Point2D { x: 3.3, y: 7.2 };
+
+    println!("Compare points:");
+    println!("Display: {}", point);
+    println!("Debug: {:?}", point);
+
+    let cmplx = Complex {
+        real: 3.3,
+        imag: 7.2,
+    };
+
+    println!("Compare complexes:");
+    println!("Display: {}", cmplx);
+    println!("Debug: {:?}", cmplx);
+}