CECS 277
LAB ASSIGNMENT #1
Assigned date:Wed 1/25
Due date: Wed 2/1
12 points

Objectives

• Be familar with classes and objects
• Create a class and objects to implement Rational arithmetic operations.

Prelab

• Read chapter 8 - Classes and objects
• Read the javadoc note posted on the class website

Problem

Create a class called Rational for performing arithmetic operations with Rationals. The class Rational must have the following data members, contructors and methods:

• Data members:
  private
  int numerator
  int denominator
• Constructors
  Default-argument constructor
  Two-argument constructor to initialize numerator and denominator
• Accessors (Getters)
  public int getNumerator() - return the numerator
  public int getDenominator() - return the denominator
• Modifiers (Setters)
  public void setNumerator(int value) - set the numerator to value
  public void setDenominator(int value) - set the denominator to value
• public inputRational()
  Input the numerator and the denominator from the keyboard
• public String toString()
  return a string  in the form numerator/denominator
• private int gcd(int  m, int n) - return the greatest common divisor
  int r;
  while(n != 0)
  { r = m % n;
    m = n;
   n = r;
  }
  return m;
• Add two Rational numbers
  pubic void add(Rational, r1, Rational r2)
  
• Subtract two Rational numbers
  public Rational  sub(Rational r)
  
• Multiply two Rational numbers
  public void mul(Rational r1,Rational r2)
  
• Divide two Rational Numbers
  public Rational div(Rational f)
  
• Return the real value of Rational r1 divided by Rational r2
  public static double divToDouble(Rational r1,Rational r2)

Write a main method to test the class Rational. All the Rational objects should must be reduced by using the greatest common denominator.

1. Input Rational object  F1
2. Input Rational object F2
3. Add the Rational objects F1 and F2 and store the result in the Rational object F3. Display the result in the following format:
   numerator/demoninator + numberator/denominator =  numberator/denominator.
4. Subtract the Rational object F2 from the Rational object F1 and store the result in the Rational object F3. Display the result in the following format:
   numerator/demoninator - numberator/denominator =  numberator/denominator.
5. Multiply the Rational object F1 with the Rational object F2 and store the result in the object F3. Display the result in the following format:
   numerator/demoninator * numberator/denominator =  numberator/denominator.
   
6. Divide the Rational object F1by the Rational object F2 and store the result in the object F3. Display the result in the following format:
   numerator/demoninator / numberator/denominator =  numerator/denominator.
7. Display the result of dividing the object F1 by the object F2 in a real number.
8. Change the numerator of object F1 to 2
9. Change the denominator of object F2 to 5
10. Display the numerator of F1 and the denominator of F2 in the following format:
    Numerator: ______
    Denominator: _____
    
    

Grading requirements

• A hard copy of your source code, and runtime output.
• Document your program with Javadoc and other comments
• Demonstrate the result to the instructor
• Submit the lab to the Beachboard.