ugBASIC User Manual

   REPEAT
       ...
   UNTIL expression

The 'REPEAT…UNTIL command will repeatedly execute a block of code until a certain condition is met. In essence, it creates a loop that continues to repeat until a specific exit condition is met.

When you don't know exactly how many times you want to repeat a block of code, but you want to continue until a certain condition is met, this is the best command to use. For example, to repeatedly prompt the user for input until they enter it correctly. Another usage is to perform calculations that require multiple iterations, such as finding the square root of a number using the Newton-Raphson method.

Make sure the condition inside UNTIL can become true at some point, otherwise your program may end up in an infinite loop. If you need to execute a loop a large number of times, consider optimizing your code to improve performance.

  REPEAT
    score = score + 1
  UNTIL alive

See also the following example files:

• control_loops_05.bas

 RptUn

DO...LOOP WHILE...WEND FOR...NEXT

If you have encountered a problem using this command, if you think there is a bug or the explanation is unclear, please open an issue for this keyword on GitHub. Thank you!