CS121 Final Exam

                           December 20, 2005

1) Identify and fix the errors in the following code:

        public class Q1 {
          public void main(string[] args) {
            int i;
            int k = 100.0;
            int j = i + 1;

            System.out.println("j is " + j + " and
              k is " + k);
          }
        }

   [10%]

2) Suppose x = 2 and y = 3, show the output, if any, of the following code. 

        if (x > 2)
          if (y > 2) {
            int z = x + y;
            System.out.println("z is " + z);
          }
        else 
          System.out.println("x is " + x);    

   [10%]

3) What is y after the following swith statement is executed?

        x = 3;
        switch (x + 3) {
          case 6: y = 1;
          default: y += 1;
        }

   [10%]

4) Convert the following for loop statement to a while loop:

        long sum = 0;
        for (int i = 0; i <= 1000; i++)
          sum = sum + i;

   [10%]

5) What is the function of the following program?

        public class Q5 {
          public static void main(String[] args) {
            new Q5(args);
          }
          
          public Q5 (String[] s) {
            for (int i = s.length - 1; i >= 0; i--)
              System.out.println(s[i]);
          }
        }

   [10%]

6) What is wrong in the following program?

        public class Q6 {
          public static void method(int x) {
          }

          public static int method(int y) {
            return y + 1;
          }
        }

   [10%]

7) Identify and fix the errors in the following code:

        public class Q7 {
          public static void main(String[] args) {
            double[100] r;

            for (int i = 0; i < r.length(); i++);
              r(i) = i * 4;
          }
        }

   [10%]

8) Write a class Loan that 
     a) supports three private data fields amount (int), interestRate (double), and nbrOfYears (int);
     b) provides a constructor for initializing the values of the three data fields;
     c) provides getter and setter methods for the three data fields;
     c) provides an overloaded toString() method for representing a Loan object
        as a string;
     e) provides method main() that creates a Loan object for a loan of $100,000 with 
        interest rate of 5% (0.05) and number of years of 10; prints the object.

   [30%]