// Tyler Rigsby, CSE 142
// Some examples of using Math and returns
public class ReturnExamples {
	public static void main(String[] args) {
		int base = 2;
		int exponent = -3;
		double result = Math.pow(base, exponent);
		double roundedResult = round2(result);
		System.out.println(base + " to the " + exponent + " is " + roundedResult);
		
		double hyp1 = hypotenuse(3, 4);
		double hyp2 = hypotenuse(2.6, 6.0);
		System.out.println("the hypotenese are: " + hyp1 + ", " + round2(hyp2));
		
		System.out.println("the displacement is: " + displacement(3.0, 7.0, 2.0));
		System.out.println(repeatTwice("nananana") + " batman!");
	}
	
	// Rounds the specified value to two decimal places and returns the result
	public static double round2(double val) {
	    //                      .125
		//                   12.5
		//               13
		//                          .13
		return Math.round(val * 100) / 100.0;
	}
	
	// Returns the length of the hypotenuse of a triangele 
	// given the lengths of shorter sides a and b
	public static double hypotenuse(double a, double b) {
		return Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2));
	}
	
	// Returns the displacement of an object given acceleration a, 
	// initial velocity v0, and time t
	public static double displacement(double a, double v0, double t) {
		return 0.5 * a * t * t + v0 * t;
	}
	
	// Returns the given String repeated twice (that is, concatenated with itself)
	public static String repeatTwice(String text) {
		return text + text;
	}
}