(Create a rational-number calculator) Write a program similar to Listing 1, Calculator.jav...

(Create a rational-number calculator) Write a program similar to Listing 1, Calculator.java. Instead of using integers, use rationals, as shown in Figure 1a. You will need to use the split method in the String class, introduced in Section 10.10.3, Replacing and Splitting Strings, to retrieve the numerator string and denominator string, and convert strings into integers using the Integer.parseInt method.

FIGURE 1 (a) The program takes three arguments (operand1, operator, and operand2) from the command line and displays the expression and the result of the arithmetic operation. (b) A complex number can be interpreted as a point in a plane.

LISTING 1 Calculator.java

1 public class Calculator {
2 /** Main method */
3 public static void main(String[] args) {
4 // Check number of strings passed
5 if (args.length != 3) {
6 System.out.println(
7 "Usage: java Calculator operand1 operator operand2");
8 System.exit(0);
9 }
10
11 // The result of the operation
12 int result = 0;
13
14 // Determine the operator
15 switch (args[1].charAt(0)) {
16 case '+': result = Integer.parseInt(args[0]) +
17 Integer.parseInt(args[2]);
18 break;
19 case '-': result = Integer.parseInt(args[0]) -
20 Integer.parseInt(args[2]);
21 break;
22 case '.': result = Integer.parseInt(args[0]) *
23 Integer.parseInt(args[2]);
24 break;
25 case '/': result = Integer.parseInt(args[0]) /
26 Integer.parseInt(args[2]);
27 }
28
29 // Display result
30 System.out.println(args[0] + ' ' + args[1] + ' ' + args[2]
31 + " = " + result);
32 }
33 }