BCS2233 OOP: Contoh 'Test 1'

1.  Response to the following statements by circling either T (TRUE) or F (FALSE). [10M]

        I.            Java enables users to develop and deploy applications on the Internet for servers, desktop computers, and small hand-held devices.( T / F)

      II.            Java is one of language that support object oriented programming. ( T / F)

    III.            Object-oriented programming (OOP) is a popular programming approach that is replacing traditional procedural programming techniques. ( T / F)

    IV.            Reserved words or keywords are words that have a specific meaning to the compiler and cannot be used for other purposes in the program. ( T / F)

      V.            System.out.println is one of the pre-defined methods in Java. ( T / F)

    VI.            The main method looks like this: ( T / F)

	public static void main(String[] args) {   // Statements; }

 

  VII.            An identifier is a sequence of characters that consist of letters, digits, underscores (_), and dollar signs ($).( T / F)

VIII.            An identifier must start with a letter, an underscore (_), or a dollar sign ($). It cannot start with a digit. ( T / F)

    IX.            An identifier in java can be of any length. ( T / F)

      X.            Logic Errors Produces incorrect result. ( T / F)

2. Match the following Statement / Name to its description. [7M]

No	Statements		Description
I.	x = 1;		Constants
II.	int x = 1;		Addition
III.	double radius;		Declaring and Initializing
IV.	final int SIZE = 3;		Multiplication
V.	+		Assignment Statements
VI.	*		Remainder
VII.	%		Declaring Variables

3. Give a brief explanation for the following questions.

         I.            What is debugging? [2 marks]

       II.            What is the difference between a constant and a variable? [2 marks]

     III.            Can Java run on any machine? What is needed to run Java on a computer? [4 marks]

     IV.            Explain the Java keywords. List any five Java keywords. [4 marks]

       V.            What is the Java source filename extension, and what is the Java bytecode filename extension?

4. Evaluate the following expressions: [3 marks]

                    I.            10 + 3 / 2

                  II.            3 * 3 + 3 % 2

                III.            3 + 2 / 2 + -2 * 4

5. Evaluate the following boolean expressions.

 [5 marks]

username=1001;

password = 234;

EXAMPLE  if(username==1001)                                 TRUE

                                 I.            if(password==234)

                               II.            if((username==1001) &&(password==234))

                             III.            if((username==1001)&&(password==789))

                             IV.            if((username==1001)||(password==789))

                               V.            if! (username==1001)

EXAMPLE   Write a for statement to print integer 1 to 20.

int I;

For (i=1; i<=10; i++)

System.out.Println(i);

I.                    Write a for statement to print integer 50 to 60. (3 marks)

II.                  Write a for statement to print the following output. (3 marks)

2                   4            6              8              10

EXAMPLE   Write a while statement to add numbers 11 through 20.

int sum =0;

int counter = 11;

while (counter <=20)

{

sum = sum + counter;

counter++;

}

III.                Write a while statement to add ODD numbers 11 through 10. [5M]

IV.                Write a while statement to continuously read in integers and stop when a negative number is entered.  [5 marks]

8. (Counting positive) Write an algorithm (pseudocode or flowchart)  and java  program that reads an unspecified number of integers, determines how many positive have been. Your program ends with the input 0.