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Arrays Test Part 1

Last updated almost 2 years ago

40 questions

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Question 36

36.

Consider the following instance variable and incomplete method. The method go should
return the difference between the smallest and largest values in the array. The array will
contain values that range from Integer.MIN_VALUE to Integer.MAX_VALUE.
private int[] array; //assume the array contains values
public int go()
{
int diff = 0;
/* blank /
return diff;
}
Which of the following code segments shown below could be used to replace
/ blank */ so that method go will work as intended?
I.
int small = 0, big = 0;
for( int i=0; i<array.length; i++)
{
if( small < array[i] )
small = array[i];
if( big > array[i] )
big = array[i];
}
diff = big - small;
II.
int small = Integer.MAX_VALUE;
int big = Integer.MIN_VALUE;
for( int i=0; i<array.length; i++)
{
if( small > array[i] )
small = array[i];
if( big < array[i] )
big = array[i];
}
diff = big - small;
III.
int small = Integer.MAX_VALUE;
int big = Integer.MIN_VALUE;
for( int i=0; i<array.length; i++)
{
if( small < array[i] )
small = array[i];
if( big > array[i] )
big = array[i];
}
diff = big - small;

I only

II only

III only

I and II only

I and III only

1

1

1

1

Question 1

1.

What is output by the code below? int[] array = {33,14,37,11,27}; out.println(array[0]);

a. 27

b. 11

c. 33

d. There is no output due to a syntax error.

e. There is no output due to a runtime exception.

Question 2

2.

What is output by the code below? int[] array = {33,14,37,11,27}; out.println(array[array.length-1]);

a. 27

b. 11

c. 33

d. There is no output due to a syntax error.

e. There is no output due to a runtime exception.

Question 3

3.

What is output by the code below? int[] array = {33,14,37,11,27}; out.println(array[array.length]);

a. 14

b. 11

c. 33

d. There is no output due to a runtime exception.

e. There is no output due to a syntax error.

Question 4

4.

What is output by the code below? int[] array = {33,14,37,11,27,4,6,2,6}; out.println(array.length);

a. 10

b. 9

c. 11

d. 5

e. 8

Question 5

5.

What is output by the code below? int[] array = {7,8,10,11,4,3}; array[array[0]/2]=15; array[array[4]+1]=9; array[array.length/2-1]=5; array[1]=array[0]+4; out.println(array[2]);

a. 7

b. 11

c. 5

d. 15

e. 9

Question 6

6.

What is output by the code below? int[] array = {7,8,10,11,4,3}; array[array[0]/2]=15; array[array[4]+1]=9; array[array.length/2-1]=5; array[1]=array[0]+4; out.println(array[0]);

a. 7

b. 11

c. 5

d. 15

e. 9

Question 7

7.

What is output by the code below? int[] array = {7,8,10,11,4,3}; array[array[0]/2]=15; array[array[4]+1]=9; array[array.length/2-1]=5; array[1]=array[0]+4; out.println(array[5]);

a. 7

b. 11

c. 5

d. 15

e. 9

Question 8

8.

What is output by the code below?

int[] array = {5,10,3,6,9,15};
for(int i=0; i<array.length/2; i=i+2)
{
array[i]=array[array.length-i-1];
}

out.println(array[0]);

a. 5

b. 10

c. 9

d. 15

e. 6

Question 9

9.

What is the output by the code below? int[] array = {5,10,3,6,9,15};
for(int i=0; i<array.length/2; i=i+2)
{
array[i]=array[array.length-i-1];
}

out.println(array[1]);

a. 5

b. 10

c. 9

d. 15

e. 6

Question 10

10.

What is output by the code below? int[] array = {5,10,3,6,9,15}; for(int i=0; i<array.length/2; i=i+2) { array[i]=array[array.length-i-1]; } out.println(array[4]);

a. 5

b. 10

c. 9

d. 15

e. 6

Question 11

11.

What is output by the code below? int[] array = {33,14,37,11,27}; out.println(array[7/2]);

a. 14

b. 11

c. 33

d. There is no output due to a runtime exception.

e. There is no output due to a syntax error.

Question 12

12.

What is output by the code below? int[] array = {33,14,37,11,27}; out.println( array[ 6 - 5 ] );

a. 14

b. 11

c. 33

d. There is no output due to a runtime error.

e. There is no output due to a syntax error.

Question 13

13.

What is output by the code below? int[] nums = new int[10]; for (int i=0; i < nums.length; i++)
{ nums[i] = i*2; } out.println(nums[8]);

a. 10

b. 12

c. 14

d. 16

e. 18

Question 14

14.

What is output by the code below? int[] nums = new int[10]; for (int i=0; i<nums.length; i++)
{ nums[i] = i*3; } out.println(nums[9]);

a. 18

b. 21

c. 15

d. 24

e. 27

Question 15

15.

What is output by the code below? int[] array = {1,2,3,4,5,6}; int sum = 0; for(int i = 0; i<=array.length; i++) sum = sum + array[i]; out.println(sum);

a. 21

b. 28

c. 27

d. There is no output due to a runtime error.

e. There is no output due to a syntax error.

Question 16

16.

What is returned by method aplus given the client code below? //method aplus public static int aplus( int[] ray ) { int stuff = 0; for(int i = 0; i<ray.length; i++) stuff = stuff + ray[i]; return stuff; } //client code int[] ar = {1,2,3,4,5,6}; System.out.println( aplus(ar) );

a. 21

b. 28

c. 27

d. There is no output due to a runtime error.

e. There is no output due to a syntax error.

Question 17

17.

What is returned by method aplus given the client code shown below? public static int aplus( int[] ray ) { int stuff = 0; for(int i = 0; i<ray.length; i++) if(ray[i] % 2 == 0) stuff = stuff + ray[i]; return stuff; } //client code int[] sRay = {9,9,7,1,2,3,4,5,6,2,2,3,7,3}; System.out.println( aplus(sRay) );

a. 12

b. 14

c. 16

d. 18

e. 20

Question 18

18.

What is returned by method aplus given the client code shown below? public static int aplus( int[] ray ) { int stuff = 0; for(int i = 0; i<ray.length; i++) { if(ray[i] % 2 == 0) { stuff = stuff + ray[i]; } } return stuff; } //client code int[] x = {2,12,11,45,22,36,5,3,1}; System.out.println( aplus(x) );

a. 66

b. 72

c. 76

d. 68

e. 80

Question 19

19.

What is output by the code below? int[] array = {7,8,10,11,4,3}; for(int i = 0; i < array.length; i++) { array[i]++; } System.out.println(array[2]);

a. 8

b. 9

c. 10

d. 11

e. 12

Question 20

20.

What is output by the code below? int[] array = {7,8,10,11,4,3}; for(int i = 0; i < array.length; i++) { array[i]+=5; } System.out.println(array[2]);

a. 8

b. 13

c. 10

d. 11

e. 15

Question 21

21.

Which of the following could fill the blank so the code would return the number of values stored in the array? int[] array = {7,8,10,11,4,3}; int elements = /* blank */

a. array.length

b. length(array)

c. array.length();

d. array.size

e. array.size();

Question 22

22.

Which of the following swaps elements 0 and 1 in array? int[] array = {7,8,10,11,4,3}; I. array[0] = array[1]; array[1] = array[0]; II. int save = array[0]; array[0] = array[1]; array[1] = save; III. array[0]+= array[1]; array[1] = array[0]-array[1]; array[0]-= array[1];

a. I only

b. II only

c. I and II only

d. II and III only

e. I, II, and II

Question 23

23.

Which of the following is true about arrays?

a. they can only store ints

b. the size of an array cannot change

c. the size can change if more items need to be added

d. they are a sub class of class Array

e. all of the above

Question 24

24.

Question 24: What is output by the following code? int[] array = {1,2,3,4,0}; int aplus = array[array[array[array[array[0]]]]]; System.out.println(aplus);

a. 1

b. 2

c. 3

d. 4

e. 0

Question 25

25.

Question 25: Consider the following method below. public static double check(int[] vals) { double[] amounts = {.25,.1,.05,.01}; if(amounts.length != vals.length) return 0.0; double total = 0.0; for(int i = 0; i < vals.length; i++) { total += vals[i] * amounts[i]; } return total; } What will the method check() return if passed the array {7, 3, 5, 4}?

a. 19

b. 2.30

c. 1.72

d. 2.34

e. 0.0

Question 26

26.

Consider the following method below. public static double check(int[] vals) { double[] amounts = {.25,.1,.05,.01}; if(amounts.length != vals.length) return 0.0; double total = 0.0; for(int i = 0; i < vals.length; i++) { total += vals[i] * amounts[i]; } return total; } What will the method check() return if passed the array {7,0,6,4,3} ?

a. 19

b. 2.30

c. 1.72

d. 2.34

e. 0.0

Question 27

27.

Consider the following instance variable and incomplete method. The method getBiggest should return the largest value in tRay. private int[] tRay; // assume the tRay contains values public int getBiggest() { int big = Integer.MIN_VALUE; /* blank / return big; } Which of the following code segments shown below could be used to replace / blank */ so that getBiggest will work as intended?
I. for (int i = 0; i < tRay.length; i++) if (tRay[i] > big)
big = tRay[i];

II. for (int item : tRay)
if (tRay[item] > big)
big = tRay[item];

III. for (int item : tRay)
if (item > big)
big = item;

a. I only

b. II only

c. II and III only

d. I and II only

e. I and III only

Question 28

28.

Consider the following instance variable and incomplete method. The method sum should sum up all of the values in array. private double[] array; //assume the array contains values public double sum() { double sum = 0; /* blank / return sum; } Which of the following code segments shown below could be used to replace / blank */ so that sum will work as intended? I. for( int i=0; i<array.length; i++)
sum = sum + array[i]; II. for( int i=array.length-1; i>-1; i--)
sum = sum + array[i]; III. for( int i=0; i<array.length; i++)
sum = sum + i;

I only

II only

III only

I and II only

I and III only

Question 29

29.

Which of the following lines would correctly fill the blank in method getStuff() to point reference retArray at an int array of size howMany?

public int [] get Stuff(int [] x, int howMany){

int [] retArray;

/* blank *\

///other code not shown

}

a. retArray = new int[];

b. retArray = new int[0];

c. retArray = int[howMany];

d. retArray = new int[howMany];

e. retArray = howMany;

Question 30

30.

Which of the following lines would correctly fill the blank in method getStuff() to return the int array named retArray?

public int [] getStuff(int [] x, int howMany)
{
int [] retArray;
//assume retArray has been properly instantiated

/blank/
}

a. return new int[];

b. return new int retArray;

c. return new int[0];

d. return retArray;

e. return x;

Question 31

31.

Question 31: Which of the following lines correctly fills in method getIt()? //method getIt should return the sum of all numbers in array public static int getIt(int[] array) { int z=0; for(int spot=1; spot <= array.length; spot++) { /* blank */ } return z; }

a. z = z + spot;

b. z = z + array[spot];

c. z = z - array[spot];

d. z = z + array[spot-1];

e. z = z + array[spot+1];

Question 32

32.

Question 32: Which of the following could correctly fill in method sumOdds()? //method sumOdds should return the sum of all odd numbers in array public static int sumOdds(int[] array) { int z=0; for(int value : array ) { /* blank */ z += value; } return z; }

a. if( z % 2 != 0)

b. if( value % 2 != 0)

c. if( array[value] % 2 != 0)

d. if( value % 2 == 0)

e. if( array[value] % 2 == 0)

Question 33

33.

Which of the following correctly fill /* blank / in method isIt() ? //method isIt should return true if all of the numbers //in array are in increasing (ascending) order public static boolean isIt(int[] array) { for(int spot=0; spot<array.length-1; spot++)
{ / blank */ return false; } return true; }

a. if(spot > spot+1)

b. if(array > array+1 )

c. if(array[spot-1] > array[spot] )

d. if(array[spot] > array[spot-1] )

e. if(array[spot] > array[spot+1] )

Question 34

34.

Which of the following correctly fill /* blank / in method copyVals()? //method copyVals should return a new array //that contains the first count values from array to num public static int[] copyVals(int[] array, int count) { / blank */ }

a. int[] nums = new int[count];
for(int i=0; i<count; i++)
{
nums[i] = array[i];
}
return nums;

b. int[] nums = new int[count];
for(int i=0, j=0; i<count; i++)
{
nums[j] = array[i];
}
return nums;

c. int[] nums = new int[count];
int j = 0;
for(int val : array)
{
nums[j] = val;
}
return nums;

d. int[] nums = new int[count];
int j = 0;
for(int val : array)
{
nums[j] = val;
j++;
}
return nums;

e. int[] nums = new int[count];
for(int i=0, j=0; i<count; j++)
{
nums[j] = array[i];
}
return nums;

Question 35

35.

Question 35: Which of the following correctly fill in method copy()? //method copy method should return a new array that contains //the first count values from array excluding occurrences of val public static int[] copy(int[] ray, int cnt, int val){ /* blank */ } a. int[] nums = new int[cnt]; for(int i=0; i<cnt; i++) { if(ray[i] != val) nums[i] = ray[i]; } return ray; b. int[] nums = new int[cnt]; for(int i=0, j=0; j<cnt && i<ray.length; i++) { if(ray[i] != val) nums[j++] = ray[i]; } return nums; c. int[] nums = new int[cnt]; int j = 0; for(int item : ray) { if(item != val) nums[j++] = item; } return nums; d. int[] nums = new int[cnt]; int j = 0; for(int item : ray){ nums[j] = item; j++; } return nums; e. int[] nums = new int[cnt]; for(int i=0, j=0; i<cnt; i++,j++) { if(ray[i] != val) nums[j] = ray[i]; } return nums;

a

b

c

d

e

Question 37

37.

What is output by the code below? int[] array = {7,8,10,11,4,3}; Arrays.sort(array); System.out.println(array[1]);

a. 3

b. 8

c. 4

d. 10

e. 11

Question 38

38.

What is output by the code below? int[] array = {7,8,10,11,4,3}; Arrays.sort(array); System.out.println(array[array.length-1]);

a. 3

b. 8

c. 4

d. 10

e. 11

Question 39

39.

What is output by the code below? int[] array = {7,8,10,11,4,3}; Arrays.sort(array); System.out.println(array[array.length/2]);

a. 7

b. 8

c. 4

d. 10

e. 11

Question 40

40.

What is output by the code below? int[] array = {7,8,10,11,4,3}; int[] other = array; array[1] = 5; System.out.println(other[1]);

a. 7

b. 8

c. 5

d. 10

e. 9