1) A variable is
a) a single digit of a
binary number.
b) eight 0s or 1s.
c) a character stored in
memory.
d) a named memory location.
2) A syntax error is a result of
a) an error that occurs
when a program is run.
b) a statement that
violates the rules of Java.
c) a statement that
includes too many variable declarations.
d) a value that is out of
range.
3) Which data type should be used to
store a decimal number?
a) Integer
b) String
c) int
d) double
4) Which of the following statements
initializes a variable?
a) int foo;
b) int foo = 0;
c) foo = 0;
d) foo = foo + 1;
5) Which statement changes the value of the variable named number?
a) div = number / div;
b) number = number / div;
c) System.out.print( number
/ div );
d) int number;
int num1,
num2;
num1 = 5;
num2 = 2;
6) Which of these expressions evaluates to the largest
value?
a) num1 / num2
b) (double)
num1 / num2
c) num1 % num2
d) num1 % num2 / num2
7) Which of the following statements does not update a variable?
a)
foo = foo + value;
b) value = foo + 1;
c)
foo++;
d) foo += value;
8) Every Java Application contains at least
one
a) class.
b) main method.
c) block.
d) class, main method, and
block.
9) What message will be displayed
when the following code
is executed?
int number;
number = 12;
if (number % 3 != 0)
System.out.print("Super");
else
System.out.print("Bowl");
a) Super
b) Bowl
c) SuperBowl
d) There will be no message
displayed.
int
numItems;
int curCost;
numItems = 7;
curCost = 24;
___10. Which expression evaluates to
true?
a) numItems == 6
&& curCost > 20
b) curCost+8 ==
curCost+40/2
c) !( numItems ==
6
)
d) numItems == 10
|| curCost <= 20
11) What message is displayed when
the
following code is
executed?
int grade;
grade = 83;
if (grade >= 87)
System.out.print("B+");
else if (grade <= 83)
System.out.print("B-");
else
System.out.print("B");
a) B+
b) B-
c) B
d) Nothing because none of
the assignment statements are executed.
___12. What is printed after the
following code executes?
for
(int i=0; i<5; i++)
System.out.print("$");
a) $
b) 5
c) $$$$$
d) $$
String fmt = "percent";
double rate = 6.8;
13) Which of the following statements is
legal?
a) fmt = fmt * 3;
b) rate = rate % 10;
c) fmt = fmt + rate;
d) rate = fmt + rate;
for (int
i
= number; i < number2; i++);
14) The above line of code contains all of
the following except:
a) update statement
b) infinite loop
c) initialization statement
d) empty statement
System.out.print("What is the number (0 to exit)? ");
int i = Stdin.readInt();
while (i > 0) {
System.out.print(i);
System.out.print("What
is the number (0 to exit)? ");
}
15) The above code contains all of the following except:
a) priming read
b) sentinel
c) infinite loop
d) empty statement
16) The else portion of an if
statement
a) is executed when the if
condition is false.
b) can contain only a
single statement.
c) must contain multiple
statements.
d) is executed when the if
condition is true.
int
hours;
double
salary, total;
System.out.print("How many hours
did you work? ");
hours = Stdin.readInt();
System.out.print("What is your
hourly salary? ");
salary = Stdin.readDouble();
if
(hours < 0 || salary < 0)
System.out.println("Invalid entry"); // A
else
{
if (hours > 40) {
total = 40 * salary; // B
total = total + (hours - 40) * (salary * 1.5);
}
else
total = hours * salary; // C
total = total
- (0.3 * total); // D
System.out.println("You earned " + total);
}
System.exit(0);
17) Four lines of code are marked A, B, C, and D with
comments.
Which are executed when 45 and
15.00 are entered?
a) A
b) B and D
c) B
d) B, C, and D
18) Which statement will evaluate to 3 if number is equal
to 57381?
a) number / 10 / 10 % 10
b) number / 10 / 10
c) number / 10 % 10 % 10
d) number % 10 % 10 / 10