Question

Which of the following loop is exit-controlled loop in Java?

• A. for
• B. while
• C. do...while
• D. until

Hint:

A {do...while loop} executes at least once because the condition is checked after the loop body.

Answer 1

The Correct Option is C

Step 1: Understanding loops in Java.

Loops are used in programming to execute a block of code repeatedly until a certain condition becomes false. Java provides several looping constructs such as for, while, and do...while.

Loops can be categorized as entry-controlled loops or exit-controlled loops.

Step 2: Entry-controlled vs exit-controlled loops.

In an entry-controlled loop, the condition is checked before executing the loop body. Examples include the for loop and while loop.

In an exit-controlled loop, the loop body executes first and the condition is checked afterward. This ensures that the loop executes at least once regardless of the condition.

Step 3: Understanding the do...while loop.

The do...while loop is the only exit-controlled loop in Java. Its structure is:

do {
    statements;
} while(condition);

In this loop, the statements inside the loop are executed first and then the condition is evaluated.

Step 4: Evaluation of options.

(A) for: Incorrect. It is an entry-controlled loop.

(B) while: Incorrect. It is also an entry-controlled loop.

(C) do...while: Correct. This is an exit-controlled loop.

(D) until: Incorrect. Java does not have an until loop.

Step 5: Conclusion.

Therefore, the loop that is classified as an exit-controlled loop in Java is the do...while loop.

Final Answer: do...while