Q: What is the key difference between a while loop and a do-while loop in C?

A The while loop guarantees at least one execution
B The do-while loop guarantees at least one execution
C The while loop checks the condition after the loop
D Both loops are exactly the same
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Answer: B

Explanation:

The fundamental difference between a while loop and a do-while loop is the placement of the condition check. In a while loop, the condition is checked before executing the loop body, so the body may not execute if the condition is false initially. In contrast, in a do-while loop, the condition is checked after the loop body, meaning the loop body will execute at least once, even if the condition is false from the start. This is a crucial feature when you want the loop to run at least once regardless of the condition's initial value, like asking for user input or prompting an action that must occur at least once.

Do-While Loop in Programming Language

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Q: What is the key difference between a while loop and a do-while loop in C?

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