ellipse

15-method/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "method"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

15-method/src/main.rs

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+const PI:f64 = 3.14;
+
+// we added derivation for debugging.
+// this trait's going to help us for printing in this code
+#[derive(Debug)]
+struct Ellipse
+    {
+        x_radius: f64,
+        y_radius: f64,
+    }
+
+// this implementation helps us to collect related things together
+// in this example all things under this will be related to Ellipse struct
+// methods gets "self" as a first paramether, this is different from functions
+// functions like "circle" no need to get self as a parameter
+// we call them related function, they can be used as a constructor
+impl Ellipse 
+    {
+        fn area(&self) -> f64
+            {
+                self.x_radius*self.y_radius*PI
+            }
+        fn x_radius(&self) -> f64
+            {
+                self.x_radius
+            }
+        fn y_radius(&self) -> f64
+            {
+                self.y_radius
+            }
+        fn can_fit(&self, second:&Ellipse) -> bool
+            {
+                self.x_radius >= second.x_radius && self.y_radius >= second.y_radius
+            }
+        fn circle(size:f64) -> Self
+            {
+                Self { x_radius: (size), y_radius: (size) }
+            }
+    }
+
+fn main()
+    {
+        println!("Hello, world!");
+
+        let ellipse1 = Ellipse
+            {
+                x_radius : 2.0,
+                y_radius : 3.0,
+            };
+        let ellipse2 = Ellipse
+            {
+                x_radius : 1.0,
+                y_radius : 2.0,
+            };
+        let circle = Ellipse::circle(5.0);
+        println!("Ellipse is {:#?}", ellipse1);
+        println!("Area of the ellipse is {}", ellipse1.area());
+        println!("X = {}", ellipse1.x_radius());
+        println!("Y = {}", ellipse1.y_radius());
+        println!("Is first be able to hug second: {}", ellipse1.can_fit(&ellipse2));
+        println!("Are of new circle = {}", circle.area());
+    }