Which programming construct is commonly used in Karel to repeat actions?

In Karel, the construct that is commonly used to repeat actions is the for loop. The for loop allows Karel to execute a specific set of instructions multiple times efficiently, which is essential in programming tasks where a series of actions need to be repeated, such as moving a certain number of steps or performing a task a set number of times.

Using a for loop is advantageous because it clearly defines the number of iterations and encapsulates the repeated logic, making the code more concise and easier to read. This is particularly useful in Karel’s environment, where repetitive actions, like placing a beeper or moving forward, are common.

In contrast, the other constructs serve different purposes. An if statement is conditional and executes a block of code only if a specified condition is true, but it does not inherently enable repetition. The switch case is used for selection between multiple options based on the value of a variable, thereby managing complex branching logic rather than repetition. Lastly, a variable declaration is simply the process of creating a variable and does not perform any actions or iterations by itself.

Thus, the for loop is the correct choice for repeating actions in Karel programming.