public/subjects/circle/README.md

circle

Instructions

Create the structures Circle and Point (which will be made of two coordinates) and the methods necessary for the code in usage to compile and run giving the expected output.

Methods:

• Point: distance() -> returns the distance between two coordinates.
• Circle:
  • diameter() -> returns the diameter of the circle.
  • area() -> returns the area of the circle.
  • intersect() -> which returns true, if 2 circles intersect.

Associated Functions

• Circle:
  • new() -> receives three 64 bits floating point numbers in the following order: x, y and radius (x and y are the coordinates of the center of the new circle). The function returns a new circle

Notions

• Using Structs
• f64 constants

Expected Functions and Structures

This snippets are incomplete and it is part of the exercise to discover how to complete them. In the usage you will find all the information that you need.

struct Circle {
	center //..
	radius //..
}

struct Point {
// ...
}

// Point
fn distance(p1, p2) -> _ {

}

// Circle
fn new(x: f64, y: f64, radius: f64) -> Circle {
}

fn diameter(_) -> _ {
}

fn area() -> _ {
}

fn intersect(self, other: ) -> bool {
}

Usage

Here is a program to test your function

use std::f64::consts;
use circle::{Circle, Point};

fn main() {
	let circle = Circle::new(500.0, 500.0, 150.0);
	let circle1 = Circle {
		center: Point { x: 80.0, y: 115.0 },
		radius: 30.0,
	};
	let point_a = Point { x: 1.0, y: 1.0 };
	let point_b = Point { x: 0.0, y: 0.0 };
	println!("circle = {:?} area = {}", circle, circle.area());
	println!("circle = {:?} diameter = {}", circle, circle.diameter());
	println!("circle1 = {:?} diameter = {}", circle1, circle1.diameter());
	println!(
		"circle and circle1 intersect = {}",
		circle.intersect(&circle1)
	);

	println!(
		"distance between {:?} and {:?} is {}",
		point_a,
		point_b,
		point_a.distance(&point_b)
	);

}

And its output

$ cargo run
circle = Circle { center: Point { x: 500.0, y: 500.0 }, radius: 150.0 } area = 70685.83470577035
circle = Circle { center: Point { x: 500.0, y: 500.0 }, radius: 150.0 } diameter = 300
circle1 = Circle { center: Point { x: 80.0, y: 115.0 }, radius: 30.0 } diameter = 60
circle and circle1 intersect = false
distance between Point { x: 1.0, y: 1.0 } and Point { x: 0.0, y: 0.0 } is 1.4142135623730951
$