arrays quiz 1

What is the output of the given code snippet? int[] mynum = new int[5]; for (int i = 1; i < 5; i++) { mynum[i] = i + 1; System.out.print(mynum[i]); } a) 2345 b) 1234 c) 1345 d) 1111 a) 2345

a) 2345

Complete the following code snippet with the correct enhanced for loop so it iterates over the array without using an index variable. String[] arr = { "abc", "def", "ghi", "jkl" }; ___________________ { System.out.print(str); } a) for (String str : arr) b) for (str : String arr) c) for (str[] : arr) d) for (arr[] : str)

a) for (String str : arr)

Which one of the following statements is a valid initialization of an array named somearray of ten elements? a) int[] somearray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; b) int somearray[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; c) int[10] somearray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; d) int somearray[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

a) int[] somearray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

In a partially filled array, the number of slots in the array that are not currently used is a) the length of the array minus the number of elements currently in the array b) the number of elements currently in the array minus the length of the array c) the length of the array plus the number of elements currently in the array d) the number of elements currently in the array

a) the length of the array minus the number of elements currently in the array

Which one of the following statements is correct for the given code snippet? int[] number = new int[3]; // Line 1 number[3] = 5; // Line 2 a) Line 2 declares and initializes an array of three elements with value 5. b) Line 2 causes a bounds error because 3 is an invalid index number. c) Line 2 initializes the third element of the array with value 5. d) Line 2 initializes all the elements of the array with value 5.

b) Line 2 causes a bounds error because 3 is an invalid index number

Which one of the following statements is correct about the given code snippet? int[ ] somearray = new int[6]; for (int i = 1; i < 6; i++) { somearray[i] = i + 1; } a) The for loop initializes all the elements of the array. b) The for loop initializes all the elements except the first element. c) The for loop initializes all the elements except the last element. d) The for loop initializes all the elements except the first and last elements

b) The for loop initializes all the elements except the first element.

Identify the correct statement for defining an integer array named numarray of ten elements. a) int[] numarray = new int[9]; b) int[] numarray = new int[10]; c) int[10] numarray; d) int numarray[10];

b) int[] numarray = new int[10];

When an array myArray is only partially filled, how can the programmer keep track of the current number of elements? a) access myArray.length() b) maintain a companion variable that stores the current number of elements c) access myArray.currentElements() d) access myArray.length() - 1

b) maintain a companion variable that stores the current number of elements

Which code snippet prints out the elements in a partially filled array of integers? a) for (int i = 0; i < myArray.length(); i++) { System.out.print(myArray[i]); } b) for (int i = 0; i < myArray.currLength(); i++) { System.out.print(myArray[i]); } c) for (int i = 0; i < currLength; i++) { System.out.print(myArray[i]); } d) for (int i = 0; i < myArray.length(); i++) { System.out.print(myArray[currLength]); }

c) for (int i = 0; i < currLength; i++) {

What is the output of the following code snippet? int[] myarray = { 10, 20, 30, 40, 50 }; System.out.print(myarray[2]); System.out.print(myarray[3]); a) 1050 b) 2030 c) 3040 d) 4050

c) 3040

What is displayed after executing the given code snippet? int[] mymarks = new int[10]; int total = 0; Scanner in = new Scanner(System.in); for (int cnt = 1; cnt <= 10; cnt++) { System.out.print("Enter the marks: "); mymarks[cnt] = in.nextInt(); total = total + mymarks[cnt]; } System.out.println(total); a) The code snippet displays the total marks of all ten subjects. b) The for loop causes a run-time time error on the first iteration. c) The code snippet causes a bounds error. d) The code snippet displays zero.

c) The code snippet causes a bounds error.

What is the result of executing this code snippet? int[] marks = { 90, 45, 67 }; for (int i = 0; i <= 3; i++) { System.out.println(marks[i]); } a) The code snippet does not give any output. b) The code snippet displays all the marks stored in the array without any redundancy. c) The code snippet causes a bounds error. d) The code snippet executes an infinite loop.

c) The code snippet causes a bounds error.

Suppose you wish to write a method that returns the sum of the elements in the partially filled array myArray. Which is a reasonable method header? a) public static int sum(int[] values) b) public static int sum() c) public static int sum(int[] values, int currSize) d) public static int sum(int[] values, int size, int currSize)

c) public static int sum(int[] values, int currSize)

6) What is the valid range of index values for an array of size 10? a) 0 to 10 b) 1 to 9 c) 1 to 10 d) 0 to 9

d) 0 to 9

Consider the following line of code: int[] somearray = new int[30]; Which one of the following options is a valid line of code for displaying the twenty-eighth element of somearray? a) System.out.println(somearray[28]); b) System.out.println(somearray(28)); c) System.out.println(somearray(27)); d) System.out.println(somearray[27]);

d) System.out.println(somearray[27]);