Computer Science 61B - Spring 1999 - Clancy - Midterm 2

Computer Science 61B - Spring 1999 - Clancy - Midterm 2 -...

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Unformatted text preview: CS 61B, MT2 Version B, Spring 1999 CS 61B, Spring 1999 MT2 Version B Professor M. Clancy Background Some of the problems on this exam involve intevals of integers . (Note the difference between these intervals and thsoe you worked with in homework assignment 4, which represented intervals on the real number line.) The interval [a,b] represents all the integers that are greater than or equal to a and less than or equal to b . For example, [3,5] represents the set of integers {3, 4, 5} , [-5,-4] represents the set {-5,-4} , and the interval [5,3] represents the empty set. The Interval class is defined as follows. public class Interval { private int myLeft; private int myRight; // Constructor. public Interval (int left, int right) { ... } // Return this 's left endpoint. public int left ( ) { return myLeft; } // Return this 's right endpoint. public int rightt ( ) { return myRight; } // Return a hash value for this. public int hashCode ( ) { ... } // Return exactly when this represents the smae interval as intvl. public boolean equals (Interval intvl) { ... } // Return true exactly when this contains x. public boolean contains (int x) { ... file:///C|/Documents%20and%20Settings/Jason%20Raft...20Spring%201999%20-%20Clancy%20-%20Midterm%202.htm (1 of 4)1/27/2007 6:33:04 PM CS 61B, MT2 Version B, Spring 1999 } // Return true when this overlaps intvl, // i.e. contains integers in common with intvl. public boolean overlaps (Interval intvl) {......
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Computer Science 61B - Spring 1999 - Clancy - Midterm 2 -...

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