How many times should the start function be called in a program?

The start function should be called exactly once in a program. It serves as the entry point for the program's execution. When the program starts running, the start function initializes everything necessary for Karel to operate and begins the sequence of instructions defined within it.

Having the start function called multiple times would cause confusion and potentially lead to errors or unexpected behavior, as Karel may reinitialize its state or try to execute commands multiple times. Therefore, in a well-structured program, the correct approach is to call the start function one time to ensure a smooth and controlled execution, allowing Karel to perform the tasks you have designed without any interruptions or resets.