SAMPLE MIDTERM EXAM FOR CSC120

Practice on this exam with only paper and pencil; do not use
your notes or book.

1. Describe three ways in which comments can be included in a Java
program.

2. Write down 10 key words in Java. Explain what they are good for.

3. Identifiers are the names used to specify different elements of a 
Java program, such as a class, method, or variable.
Explain why the following are legal or illegal identifiers

	3days  Threedays threeDays three days
	break  break2  days+3 _days

4. Explain the difference between the two operators = and ==

5. What are the values of the Java expressions 
	true && false
	false && true
	true || false

6. Rewrite the following loop, using a while statement

 	for ( i = 0; i < 20; i++){
 	sum = sum + i;
 	}
 
7. How many comparisons and how many copies are required
to sort the array {7, 3, 66, -5, 22, -77, 2}
using the Selection Sort?  
 
8. What is printed by the following program?

class Problem8 {
	public static void main(String[] args) {
		int[] data = { 1, 3, 5, 7, 9, 11 };
		int sum = 0;
			for (int i = 1; i < data.length; i++) {
				sum = sum + (data[i] + data[i-1]);
				System.out.println("sum = " + sum);
			}
	}
}

9. Write a program to print out the values of the function 
f(x) = x*x -2.0 for the values of x=0.0 to x=2.0 in steps of 0.1.
Your program should contain a method that returns  value of the
function.

10. Write a program that asks the user to enter an integer,
read the users input, and tell the user whether the number entered is
even or odd.

11. What is printed by the following program?


public class Star{ 
 	 public static void main(String[] args) {
             int line;  
             for ( line = 1;  line <= 6;  line++ ) {
                 stars( line );
             }
 	 }


 	 static void stars(int numberOfStars) {
                
               for (int i = 0; i < numberOfStars; i++) {
                   System.out.print('*');
               }
               System.out.println();  
  	}
}