You've encountered a do-while loop in a codebase which seems to execute one unnecessary iteration. What might be a possible reason for using do-while in this instance, and what could be an alternative solution?

A common use of do-while loops is for input validation, ensuring that a specific task is performed at least once before checking the condition. The unnecessary iteration might occur because the loop is designed to prompt the user for input before evaluating the condition. An alternative solution could be to use a while loop with the condition checked before the loop, but it wouldn't guarantee at least one execution.