Control Structures

:for varname :in expr ⋄ ... ⋄ :endfor Loop through the elements of expr assigning each value to varname, and then execute the statements between :for and :endfor. :goto expr Transfer control to the line number which corresponds to expr. :if expr ⋄ ... ⋄ :endif Execute the statements between :if and :endif iff expr is 1. :repeat ⋄ ... ⋄ :endrepeat Repeatedly execute the statements between :repeat and :endrepeat. :repeat ⋄ ... ⋄ :until expr Repeatedly execute the statements between :repeat and :until until expr is 0. :return Execute →0. :select expr1 ⋄ :case expr2 ⋄ ... ⋄ :caselist expr3 ⋄ ... ⋄ :endselect Execute a specific block of statements depending upon which :case or :caselist expression matches expr1. :while expr ⋄ ... ⋄ :endwhile Repeatedly execute the statements between :while and :endwhile while expr is 1. :while expr1 ⋄ ... ⋄ :until expr2 Repeatedly execute the statements between :while and :until while expr1 is 1 and expr2 is 0.