import java.lang.Math;

public class math_test {


   public static double inverse (double x) throws Exception {
       if (x != 0.0) {
           return 1.0 / x;
       } else {
           throw new Exception("Cannot compute inverse of 0.0!");
       }
   }

   public static double squareroot (double x) throws Exception {
       if (x >= 0.0) {
           return Math.sqrt(x);
       } else {
           throw new Exception("Cannot compute square root of a negative number!");
       }
   }

   public static double absolutevalue(double x) {
       // no need to throw an exception: all values of x are allowed
       if (x >= 0.0) {
         return x;
       } else {
         return -x;
       }
   }



   public static void main(String a[]) {

        // will throw an ArrayIndexOutOfBoundsException
        // int c[] = new int[10];
        // c[200] = 1;

        try {
           System.out.println(inverse(5.0));
           System.out.println(inverse(10.0));
           // will throw an exception that we throw in inverse()
           // System.out.println(inverse(0.0));
           System.out.println(inverse(3.0));
           System.out.println(inverse(-1.0));
           System.out.println(squareroot(16.0));
           // will throw an exception that we throw in squareroot()
           //System.out.println(squareroot(-4.0));
           System.out.println(squareroot(100.0));

           // and this is just an example of composition:
           System.out.println(squareroot(inverse(0.25)));
           // println(squareroot(inverse(0.25)))
           // println(squareroot(4.0))
           // println(2.0) -> prints out 2
           // solved
 

        } catch (Exception e) {
           System.out.println("something went wrong" + e.getMessage());
        }

        // can do this outside the try block!
        System.out.println(absolutevalue(10.0));
        System.out.println(absolutevalue(-5.0));


   }

}