Practice Array Example – Sum Of Elements (6.6) - Chapter 6: Arrays and Strings in Java

Practice: Array Example – Sum of Elements

Lesson 6.6Arrays and Strings in Java

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8 questions

Flashcard drill
2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
2 questions · about 1 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is an array in Java?
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Think about how an array stores data.
Question 2.
How do you declare an array in Java?
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Remember the syntax we discussed!
3Question 3.
What is the output of the following code: int[] arr = {10, 20, 30}; int sum = 0; for (int num : arr) { sum += num; } System.out.println(sum);?
- 60
- 30
- 20
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Add the values of the numbers in the array.
4Question 4.
True or False: The index of the first element in an array starts at 1.
- True
- False
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Remember how indexing works in programming.
Question 5.
Write a program that creates an array of your five favorite food items and then displays a message that combines all of them together.
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Remember how to use loops to go through each item of the array.
Question 6.
Create an array of ten random numbers, sum them, and then find the average. Include error checks for ensuring all numbers are valid.
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Use a method to validate the numbers and another to calculate both sum and average.

4 more questions in this section. Enroll free to practise them all.