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Questions and Answers
What is the output of the following code? \nint[] numbers = {1, 2, 3, 4, 5}; \nint sum = 0; \nfor (int i = 0; i < numbers.length; i++) { \n if (i % 2 == 0) { \n sum += numbers[i]; \n } \n} \nSystem.out.println(sum);
What is the output of the following code? \nint[] numbers = {1, 2, 3, 4, 5}; \nint sum = 0; \nfor (int i = 0; i < numbers.length; i++) { \n if (i % 2 == 0) { \n sum += numbers[i]; \n } \n} \nSystem.out.println(sum);
What is wrong with the following code? \nint[] arr = new int;
What is wrong with the following code? \nint[] arr = new int;
In the provided code, what is the purpose of the condition if (i % 2 == 0)?
In the provided code, what is the purpose of the condition if (i % 2 == 0)?
What would happen if the code used if (i % 2 != 0) instead of if (i % 2 == 0)?
What would happen if the code used if (i % 2 != 0) instead of if (i % 2 == 0)?
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What would be the correct way to initialize an array with three elements in Java?
What would be the correct way to initialize an array with three elements in Java?
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What will be the final value of the variable 'sum' after executing the provided code?
What will be the final value of the variable 'sum' after executing the provided code?
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What is the primary issue with the code snippet int[] arr = new int;?
What is the primary issue with the code snippet int[] arr = new int;?
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If the loop in the first code example didn't include the condition if (i % 2 == 0), what would happen?
If the loop in the first code example didn't include the condition if (i % 2 == 0), what would happen?
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What is the effect of changing the condition to if (i % 2 != 0) in the initial code?
What is the effect of changing the condition to if (i % 2 != 0) in the initial code?
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What will happen if the array is initialized as int[] numbers = new int[5]; before the loop?
What will happen if the array is initialized as int[] numbers = new int[5]; before the loop?
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Study Notes
Arrays and Loops - MCQ Practice
-
Question 1: Calculates the sum of elements at even indices (0, 2, 4) in the
numbersarray: 1 + 3 + 5 = 9. Therefore, the correct answer is A) 9. -
Question 2: The provided code snippet is incomplete and contains a syntax error. The line
int[] arr = new int;is incorrect. To declare and initialize an integer array, specify the size using square brackets, e.g.,int[] arr = new int[5];Theforloop is also incomplete, lacking a termination condition. A valid loop requires a comparison, such asi < arr.length.
Question 1: Array Summation with Conditional Logic
- The code iterates through an integer array
numbers. - It adds elements at even indices (0, 2, 4) to the
sumvariable. -
numberscontains {1, 2, 3, 4, 5}. - The loop adds 1 + 3 + 5.
- The final
sumis 9. - Therefore, the correct answer is A) 9.
Question 2: Array Declaration Error
- The code attempts to create an integer array but incorrectly omits the array size.
-
int[] arr = new int;is invalid syntax for array declaration in Java. - To declare an array, you need to specify its size using square brackets:
int[] arr = new int[size];or initialize it directly with values:int[] arr = {1,2,3}; - The code's for loop is also incomplete, missing the termination condition. A correct example would be:
for (int i = 0; i < arr.length; i++) { ... }
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Description
Test your knowledge on arrays and loops with this multiple-choice quiz. You'll encounter questions assessing your understanding of array manipulation and for loop syntax. Perfect for beginners and those looking to reinforce their programming skills.
