Show the modifications needed to add exponentiation to the class Calculator in Listing 9.12. Use ^ to indicate the exponentiation operator and the method Math.pow to perform the computation.

Listing 9.12.

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import java.util.Scanner; /** Simple line-oriented calculator program. The class can also be used to create other calculator programs. */ public class Calculator { private double result; private double precision = 0.0001; // Numbers this close to zero are treated as if equal to zero. public static void main (String [] args) { Calculator clerk = new Calculator (); try { System.out.printin("Calculator is on."); System.out.print ("Format of each line: "); System.out.println("operator space number"); System.out.println("For example: + 3"); System.out.printin("To end, enter the letter e."); clerk.doCalculation (); catch (UnknownOpException e) { clerk.handleUnknownOpException (e); catch (DivideByZeroException e) { clerk.handleDivideByZeroException (e); } System.out.println ("The final result is %3D + clerk.resultValue ()); System.out.println ("Calculator program ending."); } public Calculator () { result = 0;