func print(c: u8):
	foreign func putchar(c: i32) -> i32
	putchar(c as i32)

func print_i32(x: i32):
	if x < 0:
		print('-')
		print_i32(-x)
		return
	if x >= 10:
		print_i32(x / 10)
	print('0' + (x % 10 as u8))

func print_f32(x: f32):
	if x < 0.0:
		print('-')
		print_f32(-x)
		return
	foreign func floorf(x: f32) -> f32
	let floor = floorf(x) as i32
	print_i32(floor)
	print('.')
	mut y = x - (floor as f32)
	mut i = 0
	while i < 5:
		y = y * 10.0
		let yfloor = floorf(y) as i32
		print('0' + (yfloor as u8))
		y = y - (yfloor as f32)
		i = i + 1

struct vec3:
	x: f32
	y: f32
	z: f32

func print_vec3(v: vec3):
	print('(')
	print_f32(v.x)
	print(',')
	print_f32(v.y)
	print(',')
	print_f32(v.z)
	print(')')

func dot(a: vec3, b: vec3) -> f32:
	return a.x * b.x + a.y * b.y + a.z * b.z

func add(a: vec3, b: vec3) -> vec3:
	return vec3(a.x + b.x, a.y + b.y, a.z + b.z)

func mult(a: vec3, b: f32) -> vec3:
	return vec3(a.x * b, a.y * b, a.z * b)

func normalized(v: vec3) -> vec3:
	foreign func sqrtf(x: f32) -> f32
	return mult(v, 1.0 / sqrtf(dot(v, v)))

struct ray:
	origin: vec3
	direction: vec3

func intersect_plane(ray: ray, normal: vec3, value: f32) -> f32:
	return (value - dot(ray.origin, normal)) / dot(ray.direction, normal)

let t = intersect_plane(ray(vec3(0.0, 0.0, 5.0), vec3(0.0, 1.0, -1.0)), vec3(0.0, 0.0, 1.0), 0.0)

let a = vec3(5.0, 1.0, 4.0)
let n = normalized(vec3(1.0, 2.0, 3.0))
let b = add(a, mult(n, -dot(a, n)))

print_vec3(a)
print('\n')
print_vec3(n)
print('\n')
print_vec3(b)
print('\n')
print_f32(dot(b, n))
print('\n')