Which control structure would you use to repeat actions until a certain condition is met?

Using a while loop is ideal for repeating actions until a certain condition is met. This control structure evaluates a specified condition before executing the block of code within the loop. As long as the condition remains true, the loop continues to execute. Once the condition becomes false, the loop terminates.

This behavior makes while loops particularly useful for situations where the number of iterations isn't known beforehand and depends on dynamic conditions, such as user input or the result of computations during runtime. The ability to check the condition at the beginning of each iteration allows for greater flexibility in controlling the flow of the program based on evolving circumstances.

In contrast, other control structures like if statements and switch statements are not designed for repetition; they are used for decision-making based on conditions. For loops function well when the number of iterations is predetermined.