Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
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Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
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@hostname   : CAB     
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View Ref-FileREPEAT
  (instructions)
UNTIL condition

condition: bexp

The REPEAT-UNTIL command provides an 'exit tested' loop in which a number of
instructions are repeated until a logical condition is true.

When the command REPEAT is reached in a program, the group of instructions up
to the UNTIL are processed. Then it checks whether the logical condition after
UNTIL is true (-1). If this is the case, then the instructions after the UNTIL
are implemented. However, if the condition is false (0), then the program
execution jumps to the REPEAT. The instructions between REPEAT and UNTIL are
processed at least once, as long as the loop is not left by an EXIT IF or GOTO
command. ENDREPEAT can be used in place of UNTIL, which the Interpreter
automatically replaces by UNTIL.

Examples:

    REPEAT
    UNTIL MOUSEK

--> Waits for a mouse button to be depressed.

    i=1
    REPEAT
      INC i
      j=SQR(i)
    UNTIL i>10 AND FRAC(j)=0
    PRINT i

--> Displays the number '16' on the screen.