import "std/os.para";
import "std/time.para";

func start() {	
	let mode = io.read("Select a mode\n1: Hypotenuse\n2: Leg\n>> ");
	if (mode.tolower().replace(" ", "") == "hypotenuse") {
		hypotenuse();
	}
	elif (mode.tolower().replace(" ", "") == "1") {
		hypotenuse();
	}
	elif (mode.tolower().replace(" ", "") == "leg") {
		leg();
	}
	elif (mode.tolower().replace(" ", "") == "2") {
		leg();
	}
	else {
		print("Invalid option!");
	}
	start();
}

func hypotenuse() {
	// Find missing hypotenuse (a^2 + b^2 = c^2)
	let a = io.read("What is side a?\n>> ").to_float();
	let b = io.read("What is side b?\n>> ").to_float();
	let c2 = (a * a) + (b * b);
	let hypotenuse = math.sqrt(c2);
	print("The hypotenuse is " + hypotenuse + ".");
}

func leg() {
	// Find missing leg (c^2 - a^2 = b^2)
	let hypotenuse = io.read("What is the hypotenuse?\n>> ").to_float();
	let a = io.read("What is side a?\n>> ").to_float();
	let b2 = (hypotenuse * hypotenuse) - (a * a);
	let b = math.sqrt(b2);
	print("The missing leg is " + b + ".");
}
os.clear();
start();