Common array operations in Java - Interactive Code Practice

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Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer array of size 5.

Java

int[] numbers = new int[[1]];

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A1

B10

C0

D5

Attempts:

3 left

2fill in blank

medium

Complete the code to access the third element of the array.

Java

int third = numbers[[1]];

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A2

B3

C1

D0

Attempts:

3 left

3fill in blank

hard

Fix the error in the code to correctly print all elements of the array.

Java

for (int i = 0; i < numbers.[1]; i++) {
    System.out.println(numbers[i]);
}

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Alength()

Bsize()

Clength

Dcount

Attempts:

3 left

4fill in blank

hard

Fill both blanks to create an array of squares for numbers 1 to 5.

Java

int[] squares = new int[5];
for (int [1] = 0; [2] < 5; [1]++) {
    squares[[1]] = ([1] + 1) * ([1] + 1);
}

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Ai

Bj

Ck

Dx

Attempts:

3 left

5fill in blank

hard

Fill all three blanks to create a new array with elements doubled from the original.

Java

int[] doubled = new int[numbers.[1]];
for (int [2] = 0; [2] < numbers.length; [2]++) {
    doubled[[2]] = numbers[[2]] [3] 2;
}

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Alength

Bi

C*

D+

Attempts:

3 left