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Gforth Manual

5.8.2 Simple Loops

BEGIN code1 flag WHILE code2 REPEAT

code1 is executed and flag is computed. If it is true, code2 is executed and the loop is restarted; If flag is false, execution continues after the REPEAT.

BEGIN code flag UNTIL

code is executed. The loop is restarted if flag is false.

Programming style note: To keep the code understandable, a complete iteration of the loop should not change the number and types of the items on the stacks.

BEGIN code AGAIN

This is an endless loop.