(Create a rational-number calculator) Write a program similar to Listing 9.5, Calculator. java. Instead of using integers, use rationals, as shown in Figure 15.12a. You will need to use the split method in the String class, introduced in Section 9.2.6, Converting, Replacing, and Splitting Strings, to retrieve the numerator string and denominator string, and convert strings into integers using the Integer.parseInt method.
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