1. Which of the following pairs of declarations will cause an error message?

I. double x = 14.7;
int y = x;

II. double x = 14.7;

int y = (int) x;

III. int x = 14;

double y = x;

A. None
B. I only
C. II only
D. III only
E. I and III only

2. What output will be produced by the following?

System . out . print (" \\* This is not \n a comment *\\ ");

A. * This is not a comment *

B. \* This is not a comment *\

C. * This is not
a comment *

D. \\* This is not

a comment *\\

E. \* This is not
a comment *\

3. Consider the following code segment.

if (n != 0 && x / n > 100)
statement1 ;
else
statement2 ;

If n is of type int and has a value of 0 when the segment is executed, what will happen?
A. An ArithmeticException will be thrown.
B. A syntax error will occur.
 C. statement1, but not statement2, will be executed.
D. statement2, but not statement1, will be executed.
E. Neither statement1 nor statement2 will be executed; control will pass to the
first statement following the if statement.

4. Refer to the following code fragment.

double answer = 13 / 5;
System . out . println ("13 / 5 = " + answer );

The output is
13 / 5 = 2.0

The programmer intends the output to be

13 / 5 = 2.6

Which of the following replacements for the first line of code will not fix the problem?
A. double answer = (double) 13 / 5;
B. double answer = 13 / (double) 5;
C. double answer = 13.0 / 5;
D. double answer = 13 / 5.0;
E. double answer = (double) (13 / 5);

5. What value is stored in result if

int result = 13 - 3 * 6 / 4 % 3;

A. 5
B. 0
C. 13
D. 1
E. 12

6. Suppose that addition and subtraction had higher precedence than multiplication and
division. Then the expression
2 + 3 * 12 / 7 - 4 + 8

would evaluate to which of the following?

A. 11
B. 12
C. 5

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 D. 9
E. 4

7. Which is true of the following boolean expression, given that x is a variable of type
double?
3.0 == x * (3.0 / x)

A. It will always evaluate to false.

B. It may evaluate to false for some values of x.
C. It will evaluate to false only when x is zero.
D. It will evaluate to false only when x is very large or very close to zero.
E. It will always evaluate to true.

8. Let x be a variable of type double that is positive. A program contains the boolean
expression
( Math . pow (x ,0.5) == Math . sqrt (x))
√
. Even though x1/2 is mathematically equivalent to x, the above expression returns the
value f alse in a student’s program. Which of the following is the most likely reason?
A. M ath.pow returns an int, while M ath.sqrt returns a double.
B. x was imprecisely calculated in a previous program statement.
C. The computer stores floating-point numbers with 32-bit words.
D. There is round-off error in calculating the pow and sqrt functions.
E. There is overflow error in calculating the pow function.

9. What will the output be for the following poorly formatted program segment, if the
input value for num is 22?
int num = // call to a method that reads an integer
if ( num > 0)
if ( num % 5 == 0)
System . out . println ( num );
else System . out . println ( num + " is negative ");

A. 22
B. 4
C. 2 is negative
D. 22 is negative
E. Nothing will be output.

10. What values are stored in x and y after execution of the following program segment?

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 int x = 30 , y = 40;
if (x >= 0)
{
if (x <= 100)
{
y = x * 3;
if (y < 50)
x /= 10;
}
else
y = x * 2;
}
else
y = -x;

A. x = 30 y = 90
B. x = 30 y = -30
C. x = 30 y = 60
D. x = 3 y = -3
E. x = 30 y = 40

11. Which of the following will evaluate to true only if boolean expressions A, B, and C are
all false?
A. !A && !(B && !C)
B. !A || !B || !C
C. !(A || B || C)
D. !(A && B && C)
E. !A || !(B || !C)

12. Assume that a and b are integers. The boolean expression

!(a <= b) && (a * b > 0)

will always evaluate to true given that

A. a = b
B. a > b
C. a < b
D. a > b and b > 0
E. a > b and b < 0

13. Given that a, b, and c are integers, consider the boolean expression

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 (a < b) || !(( c == a * b) && (c < a))

Which of the following will guarantee that the expression is true?

A. c < a is false.
B. c < a is true.
C. a < b is false.
D. c == a * b is true.
E. c == a * b is true, and c < a is true.

14. In the following code segment, you may assume that a, b, and n are all type int.
if (a != b && n / (a - b) > 90)
{
/* statement1 */
}
else
{
/* statement2 */
}
/* statement3 */

What will happen if a == b is f alse?

A. /* statement 1 */ will be executed.
B. /* statement 2 */ will be executed.
C. Either /* statement 1 */ or /* statement 2 */ will be executed.
D. A compile-time error will occur.
E. An exception will be thrown.

15. Given that n and count are both of type int, which statement is true about the following
code segments?
I. for ( count = 1; count <= n; count ++)
System . out . println ( count );

II. count = 1;
while ( count <= n)
{
System . out . println ( count );
count ++;
}

A. I and II are exactly equivalent for all input values n.

B. I and II exactly equivalent for all input values n ≥ 1, but differ when n ≤ 0.

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 C. I and II are exactly equivalent only when n = 0.
D. I and II are exactly equivalent only when n is even.
E. I and II are not equivalent for any input values of n.

16. The following fragment intends that a user will enter a list of positive integers at the
keyboard and terminate the list with a sentinel.
int value = 0;
final int SENTINEL = -999;
while ( value != SENTINEL )
{
// code to process value;
...
value = ...; // read user input
}

The fragment is not correct. Which is a true statement?

A. The sentinel gets processed.
B. The last nonsentinel value entered in the list fails to get processed.
C. A poor choice of SEN T IN EL value causes the loop to terminate before all
values have been processed.
D. The code will always process a value that is not on the list.
E. Entering the SEN T IN EL value as the first value causes a run-time error.

17. Consider this code segment.

int x = 10 , y = 0;
while (x > 5)
{
y = 3;
while (y < x)
{
y *= 2;
if (y % x == 1)
y += x;
}
x -= 3;
}
System . out . println (x + " " + y);

What will be output after execution of this code segment?

A. 1 6
B. 7 12

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 C. -3 12
D. 4 12
E. -3 6
Questions 18 and 19 refer to the following method, checkN umber, which checks the
validity of its four-digit integer parameter.
/** Returns true if the 4-digit integer n is valid ,
* false otherwise .
*/
boolean checkNumber (int n)
{
int d1 ,d2 ,d3 , checkDigit , nRemaining , rem ;
// strip off digits
checkDigit = n % 10;
nRemainint = n / 10;
d3 = nRemainint % 10;
nRemainint /= 10;
d2 = nRemainint % 10;
nRemainint /= 10;
d1 = nRemainint % 10;
// check validity
rem = (d1 + d2 + d3) % 7;
return rem == checkDigit ;
}

A program invokes method checkN umber with the statement

boolean valid = checkNumber ( num );

18. Which of the following values of num will result in valid having a value of true?
A. 6143
B. 6144
C. 6145
D. 6146
E. 6147

19. What is the purpose of the local variable nRemaining?

A. It is not possible to separate n into digits without the help of a temporary
variable.
B. nRemaining prevents the parameter n from being altered.
C. nRemaining enhances the readability of the algorithm.
D. On exiting the method, the value of nRemaining may be reused.

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 E. nRemaining is needed as the left-hand side operand for integer division.
20. For ticket-selling purposes, there are three categories at a certain theater. Which of the
following code segments will assign the correct string to category for a given integer age?
I. if ( age >= 65)
category = " Senior ";
if ( age >= 18)
category = " Adult ";
else
category = " Child ";

II. if ( age >= 65)

category = " Senior ";
if (18 <= age <= 64)
category = " Adult ";
else
category = " Child ";

III. if ( age >= 65)

category = " Senior ";
else if ( age >= 18)
category = " Adult ";
else
category = " Child ";
A. I only
B. II only
C. III only
D. II and III only
E. I, II and III
21. What output will be produced by this code segment? (Ignore spacing.)
for (int i = 5; i >= 1; i - -)
{
for (int j = i; j >= 1; j - -)
System . out . print (2 * j - 1);
System . out . println ();
}

A. 9 7 5 3 1
9 7 5 3
9 7 5
9 7
0

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 B. 9 7 5 3 1
7 5 3 1
5 3 1
3 1
1

C. 9 7 5 3 1
7 5 3 1 -1
5 3 1 -1 -3
3 1 -1 -3 -5
1 -1 -3 -5 -7

D. 1
1 3
1 3 5
1 3 5 7
1 3 5 7 9

E. 1 3 5 7 9
1 3 5 7
1 3 5
1 3
1

22. Which of the following program fragments will produce this output? (Ignore spacing.)
2 - - - - -
- 4 - - - -
- - 6 - - -
- - - 8 - -
- - - - 10 -
- - - - - 12

I. for (int i = 1; i <= 6; i ++)

{
for (int k = 1; k <= 6; k ++)
if (k == i)
System . out . print (2 * k);
else
System . out . print ("-");
System . out . println ();
}

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 II. for (int i = 1; i <= 6; i ++)
{
for (int k = 1; k <= i - 1; k ++)
System . out . print ("-");
System . out . print (2 * i);
for (int k = 1; k <= 6 - i; k ++)
System . out . print ("-");
System . out . println ();
}

III. for (int i = 1; i <= 6; i ++)

{
for (int k = 1; k <= i - 1; k ++)
System . out . print ("-");
System . out . print (2 * i);
for (int k = i + 1; k <= 6 - i; k ++)
System . out . print ("-");
System . out . println ();
}

A. I only
B. II only
C. III only
D. I and II only
E. I, II and III

23. Consider this program segment.

int newNum = 0, temp ;
int num = k; //k is some predefined integer value >= 0
while ( num > 10)
{
temp = num % 10;
num /= 10;
newNum = newNum * 10 + temp ;
}
System . out . print ( newNum );

Which is a true statement about the segment?

I. If 100 ≤ num ≤ 1000 initially, the final value of newN um must be in the
range 10 ≤ newN um ≤ 100.
II. There is no initial value of num that will cause an infinit while loop.
III. If num ≤ 10 initially, newN um will have a final value of 0.

Page 10
 A. I only
B. II only
C. III only
D. II and III only
E. I, II and III

24. Consider the method reverse.

/** Returns n with its digits reversed .
* - Example : If n = 234, method reverse returns 432.
* Precondition : n > 0.
*/
int reverse (int n)
{
int rem , revNum = 0;

/* code segment */

return revNum ;
}

Which of the following replacements for /* code segment */ would cause the method
to work as intended?
I. for (int i = 1; i <= n; i ++)
{
rem = n % 10;
revNum = revNum * 10 + rem ;
n /= 10;
}

II. while (n != 0)
{
rem = n % 10;
revNum = revNum * 10 + rem ;
n /= 10;
}

III. for (int i = n; i != 0; i /= 10)

{
rem = n % 10;
revNum = revNum * 10 + rem ;
}

Page 11
A. I only
B. II only
C. I and II only
D. II and III only
E. I and III only

Page 12