More of the hello of rust by example

rustbyexample/.gitignore

@@ -1,2 +1,2 @@
-/hello/hello
+/hello/*
-/hello/print
+!/hello/*.rs

rustbyexample/hello/print_debug.rs

@@ -0,0 +1,18 @@
+#[derive(Debug)]
+struct Structure(i32);
+
+#[derive(Debug)]
+struct Deep(Structure);
+
+fn main() {
+    println!("{:?} months in a year.", 12);
+    println!(
+        "{1:?} {0:?} is the {actor:?} name.",
+        "Slater",
+        "Christian",
+        actor = "actor's"
+    );
+
+    println!("Now {:?} will print!", Structure(3));
+    println!("Now {:?} will print!", Deep(Structure(7)));
+}

rustbyexample/hello/print_debug2.rs

@@ -0,0 +1,13 @@
+#[derive(Debug)]
+struct Person<'a> {
+    name: &'a str,
+    age: u8,
+}
+
+fn main() {
+    let name = "Peter";
+    let age = 27;
+    let peter = Person { name, age };
+
+    println!("{:#?}", peter);
+}

rustbyexample/hello/print_display.rs

@@ -0,0 +1,14 @@
+use std::fmt;
+
+struct Structure(i32);
+
+impl fmt::Display for Structure {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+fn main() {
+    let s = Structure(4);
+    println!("s={}", s);
+}

rustbyexample/hello/print_display2.rs

@@ -0,0 +1,45 @@
+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)
+    }
+}
+
+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);
+}