University of Toronto --  Department of Computer Science
CSC 108F - Fall 1997
Midterm test (Clarke's section)

Aids allowed: Textbook only.
Time: 50 minutes

1.	[10 marks]  [8 marks for part (a), and 2 marks for part (b)]

(a)	Write a Person class with fields name, height, weight, with a
constructor to set all of these fields and a toString method that can
be used to print a single line of output. You decide what types to use
to represent the fields.

(b)  Write a brief segment of code to instantiate an object of the Person
class.  (2 marks)


2.	[10 marks]
Each of the following code fragments may contain an error. If there is an
error, circle it and briefly state what is wrong; otherwise, write "no error".

(a)	int i = 0.1;

(b)	String s = new String{};

(c)	int i = 10;
	int j = 9;
	int k = i / (i - j - 1);

(d)	System.out.println ("one + one = " + (1 * 1));

3.  [10 marks]

(a)	What is the output of this program fragment?
	String one = "can ";
	String two = "be, ";
	String three = "don't you think";
	System.out.println("As easy as " + one + two + three);

(b)	Using these command line arguments:
   		my name is
	What is the output of the following program segment in main
	(String[] args)?

	if (args.length == 1)
   		System.out.println("args[0] = " + args[0]);
	else if (args.length == 2) {
   		System.out.println("args[0] = " + args[0]);
   		System.out.println("args[1] = " + args[1]);}
	else if (args.length == 3) {
   		System.out.println("args[0] = " + args[0]);
   		System.out.println("args[1] = " + args[1]);
   		System.out.println("args[2] = " + args[2]);
	}

(c)	Use a for loop and write code that accomplishes the task in (b) for
any number of command line arguments. 

(d)	What is the output of this program fragment?
	int count = 0;
	while (count < 5) {
   		count++;
   		System.out.println (count + " )");
	}


4.	[10 marks]

(a)	Give an example of three primitive types and their declarations.

(b)	Give two examples of wrapper classes and create an instance of each.



5.	[10 marks]

The following segment of a main method calls a class method called
x_Square_Plus_x intended to be defined so that x_Square_Plus_x(x) = .
Write the x_Square_Plus_x method. (All you do here is to write the
x_Square_Plus_x method. No class declaration is needed, and you do not
have to complete the main method.)

	double x = 4;
	y = x_Square_Plus_x (x); // y equals 20