Computer Science 1st Semester Final Exam

1.

2 points

What is the output by the code below?

double y = 4.0;
int x = y;
System.out.println(x);

4

4.0

0

There is no output due to a syntax error.

There is no output due to a runtime error.

2.

2 points

What is output by the code below?

Scanner s = new Scanner("1 2 3 4 5 6");
int x = 0;
double z = 0;
while(s.hasNext())
{
x += s.nextInt();
z++;
}
System.out.println( x / z );

21

3

3.0

3.5

There is no output due to a runtime error.

3.

2 points

What is the output by the code below?

int cost = 3.8;
System.out.println("Price: " + cost);

3.8

Price: 3.8

Price:

There is no output due to a syntax error.

There is no output due to a runtime error.

4.

2 points

In Java, every program statement ends with a what ?

{

}

;

\

(

5.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
for(int i=0; i{
array[i]=array[array.length-i-1];
}
System.out.println(array[0]);

5

7

8

4

11

6.

2 points

What is the output by the code below using the following data file?

nums.dat
2
5
7

Scanner file = new Scanner(new File("nums.dat"));
file.nextInt();
System.out.println(file.nextInt()+" "+file.nextInt());

7

2

12

there is no output due to a compile error

there is no output due to a runtime error

7.

2 points

What is the output by the code below using the following data file?

nums.dat
2
5
7

Scanner file = new Scanner(new File("nums.dat"));
System.out.println(file.nextInt()+" "+file.nextInt());

7

2

12

there is no output due to a compile error

there is no output due to a runtime error

8.

2 points

What is the output by the code below?

String s = "aplus";
System.out.println("" + s);

aplus s

aplus

s aplus

There is no output due to a syntax error.

There is no output due to a runtime error.

9.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
int sum = 0;
for(int i = 0; i sum = sum + array[i];
System.out.println(sum);

21

28

35

There is no output due to a runtime error.

There is no output due to a syntax error.

10.

2 points

What is the output by the code below using the following data file?

nums.dat
2
5
7

Scanner file = new Scanner(new File("nums.dat"));
System.out.println(file.nextInt());

7

2

12

there is no output due to a compile error

there is no output due to a runtime error

11.

2 points

Which of the following lines correctly defines a double variable?

double v = 9.1;

v = 9.1

double = 9.1

double v = 9.1

double = 9.3;

12.

2 points

Given the following statement, var must be defined as which of the following types?

var = keyboard.nextByte();

bytes

byte

bite

boolean

string

13.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
out.println(array[array.length-1]);

4

11

8

There is no output due to a syntax error.

There is no output due to a runtime exception.

14.

2 points

Which of the following Scanner methods can be used to read in the value go back ?

next()

nextLine()

nextByte()

nextInt()

A and B only

15.

2 points

What is the output by the code below?

System.out.println("Hello ");
System.out.print("people ");

Hello Hello

Hello people

Hello

Hellopeople

Hello people

16.

2 points

What is output by the code below?

int[] nums = new int[10];
for (int i=0; i < nums.length; i++)
{
nums[i] = i*2;
}
System.out.println(nums[5]);

10

12

14

16

18

17.

2 points

Given the following statement, var must be defined as which of the following types?

var=keyboard.nextInt();

short

byte

int

char

string

18.

2 points

Every method must have an open and close what?

period

bracket

semicolon

brace

chickens

19.

2 points

What is output by the code below?

Scanner s = new Scanner("1 2 3 4 5 6");
int x = 0;
x += s.nextInt();
x += s.nextInt();
System.out.println( x );

1

3

6

10

There is no output due to a runtime error.

20.

2 points

Which of the following data types uses 64 bits of memory?

integer

double

float

char

byte

21.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
out.println(array[7/2]);

5

11

8

There is no output due to a runtime exception.

There is no output due to a syntax error.

22.

2 points

Given the following statement, var must be defined as which of the following types?

var = keyboard.next();

float

byte

char

boolean

string

23.

2 points

Which of the following Scanner methods can be used to read in the value 64532 ?

nextShort()

nextInt()

nextByte()

A and B only

all of these

24.

2 points

Which of the following Scanner methods can be used to read in the value 31980 ?

nextShort()

nextInt()

nextByte()

A and B only

all of these

25.

2 points

What is the output by the code below?

System.out.println( 3 + 3 );

6

9

3

0

-3

26.

2 points

What is output by the following code?

System.out.println(7 + "" + 5);

345

39

75

12

there is no output due to a compile error

27.

2 points

What is the output by the code below?

System.out.println( 3 + "\t" + 3 );

6

3 3

6 6

3" "3

3 3

28.

2 points

What is output by the code below?

Scanner s = new Scanner("1 2 3 4 5 6");
int x = 0;
x += s.nextInt();
x += s.nextInt();
x += s.nextInt();
x += s.nextInt();
System.out.println( x );

1

3

6

10

There is no output due to a runtime error.

29.

2 points

Which of the following lines correctly defines an integer variable?

int i = 45

i = 45;

integer = 45;

int i = 45;

integer i = 45;

30.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
out.println( array[0] );

5

7

11

There is no output due to a syntax error.

There is no output due to a runtime exception.

31.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
out.println(array.length);

4

2

3

1

5

32.

2 points

Which of the following Scanner methods can be used to read in the value 92 ?

nextByte()

nextShort()

nextInt()

nextDouble()

all of these

33.

2 points

What is the output by the code below?

int x = 4;
double y = x;
System.out.println(y);

4

4.0

0

There is no output due to a syntax error.

There is no output due to a runtime error.

34.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
out.println( array[1] );

5

7

11

There is no output due to a syntax error.

There is no output due to a runtime exception.

35.

2 points

Given the following statement, var must be defined as which of the following types?

var = keyboard.nextLine();

float

byte

char

boolean

string

36.

2 points

What is the output by the code below?

System.out.println( "\"99" );

99

"99

\"9

\

99"

37.

2 points

What is output by the code below?

Scanner s = new Scanner("d 1 o 2 g 3 c 7 t");
int count = 0;
while(s.hasNext())
{
if (count % 2 == 1)
System.out.print(s.next() + " ");
else
s.next();
count++;
}

1 2 3 7

d o g c t

d 1 o 2

g 3 c 7 t

There is no output due to a runtime error.

38.

2 points

Which of the following lines correctly defines a String variable?

String s = aplus;

s = "aplus";

String s = "aplus";

String = "aplus";

String;

39.

2 points

What is the output by the code below using the following data file?

nums.dat
3
2
5
7

Scanner file = new Scanner(new File("nums.dat"));
int size = file.nextInt();
int x = 0;
for(int i=1; i <= size; i++)
{
int num = file.nextInt();
x = x + num;
}
out.print( x + " ");

2 5 7

3 2 5 7

3 2 5

7 7 7

14

40.

2 points

What is the output by the code below using the following data file?

nums.dat
3
2
5
7

Scanner file = new Scanner(new File("nums.dat"));
int size = file.nextInt();
for(int i=1; i <= size; i++)
{
int num = file.nextInt();
out.print( num + " ");
}

2 5 7

3 2 5 7

3 2 5

7 7 7

14

41.

2 points

Which of the following is the newline character?

\t

\r

\n

\nl

\b

42.

2 points

What is output by the code below?

Scanner s = new Scanner("1 2 3 4 5 6");
int x = 0;
while(s.hasNext())
{
x += s.nextInt();
}
System.out.println( x );

21

19

23

14

There is no output due to a runtime error.

43.

2 points

What is the output by the code below?

double num = 7.5;
System.out.println("Number: " + num);

7.5

Number: 7.5

Number:

There is no output due to a syntax error.

There is no output due to a runtime error.

44.

2 points

What is the output by the code below?

System.out.print("ac" );

a\tc

a c

atc

a\c

ac

45.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
out.println( array[5/2] );

5

7

8

There is no output due to a syntax error.

There is no output due to a runtime exception.

46.

2 points

Given the following statement, var must be defined as which of the following types?

var = keyboard.nextDouble();

short

double

int

long

string

47.

2 points

What is output by the code below?

int[] array = {5,7,8,11,4};
out.println(array[array.length]);

4

11

8

There is no output due to a syntax error.

There is no output due to a runtime exception.

48.

2 points

Which of the following data types uses 32 bits of memory?

integer

double

long

char

byte

49.

2 points

What is the output by the code below?

System.out.print("ab\\\\ab" );

ab\ab

ab

ab\\ab

bab

abb

50.

2 points

Which of the following Scanner methods can be used to read in the value 11.25 ?

nextDouble()

nextLong()

nextByte()

nextInt()

A and B only