CMSC 202 — Spring 2013

Creating the Lab3 and Fraction Classes

1. Open the project created in our first lab "LabAssignments"
2. Create a new package with the name "lab3"
3. Create two new classes:
   • FractionDriver - this will serve as our driver and contain our main method. It will read in input from the user, create instances of the Fraction object, and print output.
   • Fraction - this class will represent a fraction. It will implement methods for usual tasks done with fractions (adding, multiplying, converting to decimal, etc.).
4. Copy and paste the following code into FractionDriver. This is the code that will drive and test Fraction. We'll be un-commenting sections of the code as we implement Fraction.

package lab3;
 
import java.util.Scanner;
 
/**
 * FractionDriver.java - driver to test the Fraction class.
 * @version
 * @author
 * @Lab CMSC 202 - Spring 2012
 * @section
 */
 
public class FractionDriver {
     
    /**
    * Driver to test the Fraction class.
    * Precondition: None
    * Postcondition: None
    * @param radius: args Command-line arguments
    * @return: None
    */
    public static void main(String[] args) {
/*

		//Create a Scanner object on System.in
        Scanner scanner = new Scanner(System.in);
        int numerator = 1;
        int denominator = 1;
          
		//Use the Scanner object to get the numerator and denominator of the first fraction
        System.out.println("Enter the numerator of the first fraction ");
        numerator = scanner.nextInt();
        System.out.println("Enter the denominator of the first fraction ");
        denominator = scanner.nextInt();          
        
		//Create the first fraction object with input provided and print by invoking toString()
        Fraction firstFraction = new Fraction(numerator, denominator);
        System.out.println("The first fraction is " + firstFraction.toString());
        
		//Create and print the reciprocal of the first fraction
        Fraction reciprocalFirstFraction = new Fraction(denominator, numerator);
        System.out.println("The reciprocal of first fraction is " + reciprocalFirstFraction);
        
		//Use the Scanner object to get the numerator and denominator of the second fraction
        System.out.println("Enter the numerator of the second fraction ");
        numerator = scanner.nextInt();
        System.out.println("Enter the denominator of the second fraction ");
        denominator = scanner.nextInt();
          
		//Create the second fraction object with input provided and print by invoking toString()
        Fraction secondFraction = new Fraction(numerator, denominator);
        System.out.println("The Second Fraction is " + secondFraction.toString());
 
		//Create and print the reciprocal of the second fraction
    	Fraction reciprocalSecondFraction = new Fraction(denominator, numerator);
        System.out.println("The reciprocal of the second fraction is " +
                reciprocalSecondFraction);
          
*/ 
         
/*
		//Print the decimal value of the two fractions by invoking decimalValue()
    	System.out.printf("The decimal value of the first fraction is %.2f\n",
                firstFraction.decimalValue());
        System.out.printf("The decimal value of the second fraction is %.2f\n",
                secondFraction.decimalValue());
*/   
         
/*
		//Print the product of the fractions by invoking multiply()
    	System.out.println("The product of the two fractions is " +
                firstFraction.multiply(secondFraction).toString());
		
		//Print whether or not the fractions are equivalent by invoking equals()
        System.out.println("Are these fractions equivalent? " +
                firstFraction.equals(secondFraction));
*/
    }
 
}