Question

For which of the following tasks would a for-each loop be appropriate?

A. Reversing the order of the elements in an array.
B. Printing all the elements at even indices of an array.
C. Printing every element in an array.
D. Determining how many elements in an array of doubles are positive.
E. Determining whether an array of Strings is arranged in alphabetical order.
F. Printing every even number in an array of ints.

Answer 1

A for-each loop would be appropriate for printing elements at even indices, printing every element, and printing every even number in an array.

Step-by-step explanation:

A for-each loop would be appropriate for the following tasks:

B. Printing all the elements at even indices of an array. With a for-each loop, you can iterate through the array and print only the elements at even indices.

C. Printing every element in an array. A for-each loop allows you to easily print every element in an array without having to manually index and access each element.

F. Printing every even number in an array of ints. Using a for-each loop, you can iterate through the array and print only the even numbers.

For the other tasks, a different type of loop or approach would be more appropriate.

Answer 2

A for-each loop is appropriate for tasks C, D, and F, which involve iterating over all array elements without needing index-based operations or comparisons between elements.

Step-by-step explanation:

A for-each loop is best suited for operations where you need to access each element of a collection or array, but you don't need to modify the collection or require the use of an index to perform operations. Therefore, the tasks from your list where a for-each loop would be appropriate are:

• Printing every element in an array (C).
• Determining how many elements in an array of doubles are positive (D).
• Printing every even number in an array of ints (F).

A for-each loop wouldn't be ideal for reversing the order of elements or situations where you need to compare one element with another, such as checking if an array is in alphabetical order, or selectively accessing elements like those at even indices.