pep8 program specify a structure called Fraction with num and denom as its integ

Question

pep8 program

specify a structure called Fraction with num and denom as its integer members. Keep asking the user if he or she wants to add a fraction. If the answer is 'y' or 'Y', allocate memory dynamically for a Fraction structure, read a fraction and store the pointer returned by new in a locally defined array of integers of maximum size 10.

Then, read a Fraction, storing it in a Fraction variable local to main and search for it in the above array of pointers. Print the index where it was found or "Not found" otherwise.

The following shows a sample execution of the program:

Input: 2 / 3 1 / 2 1 / 4 1 / 3 2 / 5 -99

Enter fraction to search for: 1/3

1/3 was found at index 3.

Explanation / Answer

import java.util.Vector;
import java.util.Enumeration;

class FractionVector {

public static void main(String[] args) {
   Vector fraclist = new Vector();

// create Fractions and add them to the vector

Fraction first = new Fraction(1,2);
Fraction second = new Fraction(3,2);
Fraction third = new Fraction(1,7);
Fraction fourth;
Fraction fracout;
   fraclist.addElement(first);
   fraclist.addElement(second);
   fraclist.addElement(third);

// create Enumeration and use it to print all Fractions in the Vector

System.out.println(" Contents of the Vector:");
   Enumeration allfracs = fraclist.elements();
   while (allfracs.hasMoreElements()) {
fracout = (Fraction) allfracs.nextElement();
   System.out.println("The next fraction is " + fracout);
   }
// add another fraction to the Vector

fourth = first.add(second);
System.out.println("The sum is: " + fourth);
   fraclist.insertElementAt(fourth,0);

// use Enumeration to print all elements again

System.out.println(" Contents of the Vector:");
   allfracs = fraclist.elements();
   while (allfracs.hasMoreElements()) {
   fracout = (Fraction) allfracs.nextElement();
   System.out.println("The next fraction is " + fracout);
   }

// get a Fraction out of the Vector and print it

   fracout = (Fraction) fraclist.elementAt(1);
   System.out.println(" The fraction in position 1 is " + fracout);

// put a String in the vector

   fraclist.insertElementAt("String object",3);
   String from = (String) fraclist.elementAt(3);
   System.out.println("In position 3 we inserted the String: " + from);
}
}

thank you

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