In Java, interpret nested do/while and while statements formatted on separate lines. What is printed?\n\npublic class Test {\n public static void main(String[] args) {\n int I = 1;\n do while (I < 1)\n System.out.print("I is " + I);\n while (I > 1);\n }\n}

Difficulty: Medium

Correct Answer: No output is produced.

Explanation:


Introduction / Context:
This classic formatting puzzle tests how Java parses a do-while statement whose body is itself a while statement. The key is understanding statement boundaries and which loop actually executes.


Given Data / Assumptions:

  • I is initialized to 1.
  • The do statement's body is a single while statement: while (I < 1) System.out.print(...);
  • After that body completes, the trailing while (I > 1); is the terminator of the do loop.


Concept / Approach:
Evaluate the inner while (I < 1) first: since I == 1, it executes zero times and prints nothing. Then the outer do-while checks its condition (I > 1), which is false, so the entire construct ends with no output.


Step-by-Step Solution:
Inner while condition: I < 1false at entry ⇒ body never runs.The do executes its single statement (the inner while) exactly once (doing nothing).Outer terminating condition: I > 1false; loop finishes.No print statements were executed ⇒ no output.


Verification / Alternative check:
Change I to 0 and you will see "I is 0" printed repeatedly until the outer condition stops it (it still won’t in this exact shape without changing I).


Why Other Options Are Wrong:
They assume the print executes at least once or a compilation problem; the code is valid and the inner condition is false.


Common Pitfalls:
Misreading line breaks as scoping braces; Java does not add implicit blocks based on newlines or indentation.


Final Answer:
No output is produced.

More Questions from Flow Control

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion