CMSC 202 — Fall 2011

Creating the Lab3 and Fraction Classes

1. Create a new project with the name "Lab3"
2. Create a new package with the name "lab3"
3. Create two new classes:
   • Lab3 - 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 Lab3. 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;

/**
 * Lab3.java - driver to test the Fraction class.
 *
 */
public class Lab3 {
	
	/**
	 * Driver to test the Fraction class.
	 * It reads input from user to construct instances of the Fraction and tests all methods of Fraction
	 * 
	 * @param args Command-line arguments
	 */
	public static void main( String[] args )
	{
/*
		Scanner scanner = new Scanner(System.in);
		int numerator = 1;
		int denominator = 1;
		
		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();            
		
		Fraction firstFraction = new Fraction(numerator, denominator);
		System.out.println("The first fraction is " + firstFraction.toString());
		
		Fraction reciprocalFirstFraction = new Fraction(denominator, numerator);
		System.out.println("The reciprocal of first fraction is " + reciprocalFirstFraction.toString());
		
		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();
		
		Fraction secondFraction = new Fraction(numerator, denominator);
		System.out.println("The Second Fraction is " + secondFraction.toString());
		
		Fraction reciprocalSecondFraction = new Fraction(denominator, numerator);
		System.out.println("The reciprocal of the second fraction is " + reciprocalSecondFraction.toString());
		
		
		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());
		
		System.out.println("The product of the two fractions is " + firstFraction.multiply(secondFraction).toString());
		System.out.println("Are these fractions equivalent? " + firstFraction.equals(secondFraction));
*/

	}
}