Download SampleExam(Ch1, 2, 3..

Name:_______________________
Covers Chapters 1, 2, 3 (75 mins)
CSCI 1301 Introduction to Programming
Armstrong Atlantic State University
Instructor: Y. Daniel Liang
Circle your choices on this paper
Part I: Multiple Choice Questions: (1 pt each) (Multiple answers
allowed for this test)
1.
The binary value 10011 is __________ in hex.
a.
b.
c.
d.
e.
13
10
12
14
1A
#
2.
Hexadecimal number A1 is binary number ____________.
a.
b.
c.
d.
e.
11001001
10010100
11100001
01100001
10100001
#
3.
Note that the Unicode for character A is 65. The expression "A" + 1
evaluates to ________.
a.
b.
c.
d.
A1
B
66
Illegal expression
#
4.
The expression (int)(76.0252175 * 100) / 100 evaluates to _________.
a.
b.
c.
d.
76
76.02
76.0252175
76.03
#
5.
a.
b.
c.
d.
To add a value 1 to variable x, you write
x +=
x
x :=
x
1;
= 1 + x;
1;
= x + 1;
1
e.
1 + x = x;
#
6.
To declare a constant MAX_LENGTH inside a method with value 99.98, you
write
a.
b.
c.
d.
#
7.
final float MAX_LENGTH = 99.98;
double MAX_LENGTH = 99.98;
final MAX_LENGTH = 99.98;
final double MAX_LENGTH = 99.98;
what is y displayed in the following code?
public class Test {
public static void main(String[] args) {
int x = 1;
int y = x++ + x;
System.out.println("y is " + y);
}
}
a.
b.
c.
d.
#
8.
a.
b.
y
y
y
y
is
is
is
is
2.
1.
3.
4.
Is 'a' larger than 'A'.
true
false
#
9.
The Unicode of 'a' is 97. What is the Unicode for 'c'?
a.
b.
c.
d.
98
99
97
96
#
10.
Which of the Boolean expressions below is incorrect?
a.
b.
c.
d.
e.
(-10 < x < 0)
!(x > 0) && (x > 0)
(true) && (3 => 4)
(x > 0) || (x < 0)
(x != 0) || (x = 0)
2
#
11.
Suppose x=10 and y=10 what is x after evaluating the expression (y >
10) && (x++ > 10).
a.
b.
c.
9
11
10
#
12.
Which of the following is the correct expression that evaluates to true if
the number x is between 1 and 100 or the number is negative?
a.
b.
c.
d.
((x < 100) && (x
(1 > x > 100) ||
1 < x < 100 && x
((x < 100) && (x
> 1)) && (x < 0)
(x < 0)
< 0
> 1)) || (x < 0)
#
13.
Analyze the following code:
Code 1:
boolean even;
if (number % 2 == 0)
even = true;
else
even = false;
Code 2:
boolean even = (number % 2 == 0);
a.
b.
c.
d.
#
14.
Code
Both
Both
Code
1 has syntax errors.
Code 1 and Code 2 are correct, but Code 2 is better.
Code 1 and Code 2 have syntax errors.
2 has syntax errors.
Assume x is 0. What is the output of the following statement?
if (x > 0)
print("x is greater than 0");
else if (x < 0)
print("x is less than 0");
else
print("x equals 0");
a.
x equals 0
3
b.
c.
d.
x is less than 0
x is greater than 0
None
#
15.
Suppose x=10 and y=10 what is x after evaluating the expression (y &gt;=
10) || (x++ > 10).
a.
b.
c.
#
16.
9
10
11
Analyze the following code:
boolean even = ((231 % 2) == 0);
if (even = true)
System.out.println("It is even!");
else
System.out.println("It is odd!");
a.
b.
c.
d.
#
17.
The
The
The
The
program
program
program
program
has a runtime error
displays "It is even!"
displays "It is odd!"
has a syntax error
What is the printout of the following switch statement?
char ch = 'b';
switch (ch) {
case 'a':
System.out.print(ch);
case 'b':
System.out.print(ch);
case 'c':
System.out.print(ch);
case 'd':
System.out.print(ch);
}
a.
b.
c.
d.
e.
bbb
b
bcd
bb
abcd
#
18.
Analyze the following code.
int x = 0;
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int y = ((x < 100) & (x > 0)) ? 1: -1;
a.
b.
c.
The code has a syntax error because & must be &&.
y becomes -1 after the code is executed.
y becomes 1 after the code is executed.
#
19.
Suppose x=0 and y=0 what is x after evaluating the expression (y > 0) &&
(1 > x++).
a.
b.
c.
-1
1
0
#
20.
Analyze the following code fragments that assign a boolean value to the
variable even.
Code 1:
if (number % 2 == 0)
even = true;
else
even = false;
Code 2:
even = (number % 2 == 0) ? true: false;
Code 3:
even = number % 2 == 0;
a. Code 2 has a syntax error,
in the conditional expression.
b. Code 3 has a syntax error,
c. All three are correct, but
d. All three are correct, but
e. All three are correct, but
#
21. Which of the
positive.
a.
if (radius
b.
if (radius
c.
if (radius
d.
if (radius
because you cannot have true and false literals
because you attempt to assign number to even.
Code 2 is preferred.
Code 3 is preferred.
Code 1 is preferred.
following code displays the area of a circle if the radius is
!= 0) System.out.println(radius * radius * Math.PI);
>= 0) System.out.println(radius * radius * Math.PI);
> 0) System.out.println(radius * radius * Math.PI);
<= 0) System.out.println(radius * radius * Math.PI);
#
22. What is 1.0 + 1.0 + 1.0 + 1.0 + 1.0 == 5.0?
a. There is no guarantee that 1.0 + 1.0 + 1.0 + 1.0 + 1.0 == 5.0 is true.
b. false
c. true
#
5
23. The statement System.out.printf("%10s", 123456) outputs ___________. (Note:
* represents a space)
a.
b.
c.
d.
****123456
123456****
23456*****
12345*****
Part II: Show the output of the following code: (Write your output on the right
side)
(5 pts)
public class Test {
public static void main(String[] args) {
int x1, x2, i, j, k, y, z;
float f;
x1 = 1;
x2 = 1;
y = 5 + x1--;
z = 5 + ++x2;
i = 6 % 4;
j = 1;
j += j + 3;
k = 25 / 2;
f = (float)((2 / 5) * k);
System.out.println("x1 is " + x1);
System.out.println("x2 is " + x2);
System.out.println("i is " + i);
System.out.println("j is " + j);
System.out.println("k is " + k);
System.out.println("y is " + y);
System.out.println("z is " + z);
System.out.println("f is " + f);
}
}
Part III:
A. (5 pts) Write a complete program named Exam1.java. The program reads three double numbers
from the keyboard and displays the average of these three numbers.
6
B. (5 pts) Write a program that prompts the user to enter an integer and checks whether the number
is divisible by both 5 and 6, or neither of them, or just one of them. Here are some sample outputs
for inputs 10, 30, and 23.
10 is divisible by 5 or 6, but not both
30 is divisible by both 5 and 6
23 is not divisible by either 5 or 6
7
Key
Part I: Multiple Choice Questions.
1.
The binary value 10011 is __________ in hex.
a. 13
b. 10
c. 12
d. 14
e. 1A
Key:a
#
2. Hexadecimal number A1 is binary number ____________.
a. 11001001
b. 10010100
c. 11100001
d. 01100001
e. 10100001
Key:e
#
3.
Note that the Unicode for character A is 65. The expression "A" + 1 evaluates to ________.
a. A1
b. B
c. 66
d. Illegal expression
Key:a
#
4. The expression (int)(76.0252175 * 100) / 100 evaluates to _________.
a. 76
b. 76.02
c. 76.0252175
d. 76.03
Key:a
#
5.
To add a value 1 to variable x, you write
a.
b.
c.
d.
x += 1;
x = 1 + x;
x := 1;
x = x + 1;
8
e.
1 + x = x;
Key:abd
#
6.
a.
b.
c.
d.
Key:d
To declare a constant MAX_LENGTH inside a method with value 99.98, you write
final float MAX_LENGTH = 99.98;
double MAX_LENGTH = 99.98;
final MAX_LENGTH = 99.98;
final double MAX_LENGTH = 99.98;
#
7. what is y displayed in the following code?
public class Test {
public static void main(String[] args) {
int x = 1;
int y = x++ + x;
System.out.println("y is " + y);
}
}
a. y is 2.
b. y is 1.
c. y is 3.
d. y is 4.
Key:c
#
8.
Is 'a' larger than 'A'.
a. true
b. false
Key:a
#
9.
a.
b.
c.
d.
Key:b
#
10.
The Unicode of 'a' is 97. What is the Unicode for 'c'?
98
99
97
96
Which of the Boolean expressions below is incorrect?
9
a.
(-10 &lt; x &lt; 0)
b.
!(x &gt; 0) && (x &gt; 0)
c.
(true) && (3 =&gt; 4)
d.
(x &gt; 0) || (x &lt; 0)
e.
(x != 0) || (x = 0)
Key:ace
#
11.
Suppose x=10 and y=10 what is x after evaluating the expression (y &gt; 10) && (x++ > 10).
a.
9
b.
11
c.
10
Key:c
#
12.
Which of the following is the correct expression that evaluates to true if the number x is
between 1 and 100 or the number is negative?
a.
b.
c.
d.
Key:d
#
13.
((x < 100) && (x > 1)) && (x < 0)
(1 > x > 100) || (x < 0)
1 < x < 100 && x < 0
((x < 100) && (x > 1)) || (x < 0)
Analyze the following code:
Code 1:
boolean even;
if (number % 2 == 0)
even = true;
else
even = false;
Code 2:
boolean even = (number % 2 == 0);
a. Code 1 has syntax errors.
b. Both Code 1 and Code 2 are correct, but Code 2 is better.
c. Both Code 1 and Code 2 have syntax errors.
d. Code 2 has syntax errors.
Key:b
10
#
14. Assume x is 0. What is the output of the following statement?
if (x > 0)
print("x is greater than 0");
else if (x < 0)
print("x is less than 0");
else
print("x equals 0");
a. x equals 0
b. x is less than 0
c. x is greater than 0
d. None
Key:a
#
15.
Suppose x=10 and y=10 what is x after evaluating the expression (y &gt;= 10) || (x++ > 10).
a.
9
b.
10
c.
11
Key:b
#
16. Analyze the following code:
boolean even = ((231 % 2) == 0);
if (even = true)
System.out.println("It is even!");
else
System.out.println("It is odd!");
a. The program has a runtime error
b. The program displays "It is even!"
c. The program displays "It is odd!"
d. The program has a syntax error
Key:b
#
17. What is the printout of the following switch statement?
char ch = 'b';
switch (ch) {
case 'a':
11
System.out.print(ch);
case 'b':
System.out.print(ch);
case 'c':
System.out.print(ch);
case 'd':
System.out.print(ch);
}
a.
bbb
b.
b
c.
bcd
d.
bb
e.
abcd
Key:a
#
18.
Analyze the following code.
int x = 0;
int y = ((x < 100) & (x > 0)) ? 1: -1;
a.
The code has a syntax error because & must be &&.
b.
y becomes -1 after the code is executed.
c.
y becomes 1 after the code is executed.
Key:b
#
19.
Suppose x=0 and y=0 what is x after evaluating the expression (y > 0) && (1 > x++).
a.
-1
b.
1
c.
0
Key:c
#
20.
Analyze the following code fragments that assign a boolean value to the variable even.
Code 1:
if (number % 2 == 0)
even = true;
else
even = false;
Code 2:
even = (number % 2 == 0) ? true: false;
12
Code 3:
even = number % 2 == 0;
a. Code 2 has a syntax error, because you cannot have true and false literals in the conditional
expression.
b. Code 3 has a syntax error, because you attempt to assign number to even.
c. All three are correct, but Code 2 is preferred.
d. All three are correct, but Code 3 is preferred.
e. All three are correct, but Code 1 is preferred.
Key:d
#
21. Which of the following code displays the area of a circle if the radius is positive.
a. if (radius != 0) System.out.println(radius * radius * Math.PI);
b. if (radius >= 0) System.out.println(radius * radius * Math.PI);
c. if (radius > 0) System.out.println(radius * radius * Math.PI);
d. if (radius <= 0) System.out.println(radius * radius * Math.PI);
Key:c
#
22. What is 1.0 + 1.0 + 1.0 + 1.0 + 1.0 == 5.0?
a. There is no guarantee that 1.0 + 1.0 + 1.0 + 1.0 + 1.0 == 5.0 is true.
b. false
c. true
Key:a
#
23. The statement System.out.printf("%10s", 123456) outputs ___________. (Note: * represents a
space)
a.
b.
c.
d.
Key:a
****123456
123456****
23456*****
12345*****
Part II: Show the output of the following code:
(5 pts)
public class Test {
public static void main(String[] args) {
int x1, x2, i, j, k, y, z;
float f;
x1 = 1;
x2 = 1;
y = 5 + x1--;
z = 5 + ++x2;
i = 6 % 4;
j = 1;
j += j + 3;
13
k = 25 / 2;
f = (float)((2 / 5) * k);
System.out.println("x1 is " + x1);
System.out.println("x2 is " + x2);
System.out.println("i is " + i);
System.out.println("j is " + j);
System.out.println("k is " + k);
System.out.println("y is " + y);
System.out.println("z is " + z);
System.out.println("f is " + f);
}
}
x1 is 0
x2 is 2
i is 2
j is 5
k is 12
y is 6
z is 7
f is 0.0
Part III:
B. (5 pts) Write a complete program named Exam1.java. The program reads three double numbers
from the keyboard and displays the average of these three numbers.
import java.util.Scanner;
public class Test {
/**Main method*/
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// Prompt the user to enter an integer
System.out.print("Enter number1:");
int number1 = input.nextInt();
System.out.print("Enter number2:");
int number2 = input.nextInt();
System.out.print("Enter number3:");
int number3 = input.nextInt();
// Display results
System.out.println("The average is " + (number1 + number2 + number3) / 3);
}
}
14
B. (5 pts) Write a program that prompts the user to enter an integer and checks whether the number
is divisible by both 5 and 6, or neither of them, or just one of them. Here are some sample outputs
for inputs 10, 30, and 23.
10 is divisible by 5 or 6, but not both
30 is divisible by both 5 and 6
23 is not divisible by either 5 or 6
import java.util.Scanner;
public class Exercise3_12 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// Prompt the user to enter an integer
System.out.print("Enter an integer: ");
int number = input.nextInt();
if (number % 5 == 0 && number % 6 == 0)
System.out.println(number + " is divisible by both 5 and 6");
else if (number % 5 == 0 ^ number % 6 == 0)
System.out.println(number + " is divisible by both 5 and 6, but not
both");
else
System.out.println(number + " is not divisible by either 5 or 6");
}
}
15