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What is the main difference between a do-while loop and a while loop in C?

easy📝 Conceptual Q11 of 15
C - Loops
What is the main difference between a do-while loop and a while loop in C?
AA <code>do-while</code> loop cannot be used with integers.
BA <code>do-while</code> loop checks the condition before executing the code block.
CA <code>do-while</code> loop executes the code block at least once before checking the condition.
DA <code>do-while</code> loop does not require a semicolon after the while condition.
Step-by-Step Solution
Solution:

  1. Step 1: Understand the execution order of loops

    A while loop checks the condition first, so it may not run the code block if the condition is false initially.

  2. Step 2: Identify the behavior of do-while loop

    A do-while loop runs the code block once before checking the condition, ensuring at least one execution.

  3. Final Answer:

    A do-while loop executes the code block at least once before checking the condition. -> Option C

  4. Quick Check:

    do-while runs once first = A [OK]
Quick Trick: Remember: do-while runs code first, then checks condition [OK]
Common Mistakes:
  • Thinking do-while checks condition first
  • Believing semicolon after while is optional
  • Confusing do-while with while loop behavior

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