Arrays Test Part 1

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

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

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]);

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]);

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]);

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) );

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) );

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 */

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);

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} ?

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;

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;

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

}

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; }

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; }

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 */ }

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;

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