Repetition Control Structures Quiz

What is the purpose of a repetition control structure in programming?

• To execute a block of code only once

• To execute a block of code repeatedly based on a condition

• To create a new function

• To define a variable

In a 'for' loop, which part is responsible for updating the loop variable?

• Termination

• Updating

• Condition

• Initialization

What will the following code segment output? 'for (int i = 0; i < 5; i++) { System.out.print(i); }'

• 01235

• 12345

• 01234

• 54321

What is the output of the following code? 'int sum = 0; for (int i = 0; i < 5; i++) { sum += i; } System.out.print(sum);'

• 5

• 15

• 10

• 0

In a 'while' loop, what happens if the condition is false at the start?

• The loop executes indefinitely

• The loop executes twice

• The loop executes once

• The loop does not execute at all

What is the purpose of a sentinel value in a loop?

• To define a function

• To initialize a variable

• To terminate the loop based on a specific condition

• To create an infinite loop

Which of the following Java code snippets correctly calculates the total, average, and frequency of numbers entered by the user?

• int total = 0, count = 0, freq = 0;

  Scanner sc = new Scanner(System.in);

  while (true)

  { int number = sc.nextInt();

  if (number == -1) break;

  total += number;

  count++;

  if (number == specificNumber) freq++;

  }

  double average = (double) total / count;

• int total = 0, count = 0;

  Scanner sc = new Scanner(System.in);

  while (sc.hasNextInt())

  { total += sc.nextInt();

  count++;

  }

  double average = total / count;

• int total = 0, count = 0;

  Scanner sc = new Scanner(System.in);

  while (sc.hasNextInt()) {

  total += sc.nextInt();

  count++;

  }

  double average = total / count;

What will the following code segment output? 'int i = 0; while (i < 3) { System.out.print(i); i++; }'

• 0123

• 123

• 012

• 321

In the context of loops, what does 'accumulate' typically refer to?

• To decrease a value

• To create a new variable

• To store multiple values in an array

• To sum values over iterations.

What is a counter-controlled loop?

• A loop that stops when a sentinel value is entered.

• A loop that executes a fixed number of times.

• A loop that runs without conditions.

• A loop that tests the condition after execution.