Editing BASIC-PLUS (section)

===Statement modifiers===
BASIC-PLUS added the concept of "statement modifiers", [[JOSS]]-like conditions that could be applied to any statement. For instance, {{code|PRINT I IF I <> 10|lang=basic}} is the equivalent of {{code|1 = IF I <> 10 THEN PRINT I|lang=basic}}{{sfn|PLUS|1972|p=8-17}} The opposite was also provided, {{code|1 = PRINT I UNLESS I = 10|lang=basic}} was the equivalent of {{code|IF I <> 10 THEN PRINT I|basic}}.{{sfn|PLUS|1972|p=8-18}}

{{code|FOR}} loops worked as in other versions of BASIC, and the {{code|NEXT}} command could not be used in an expression to exit early.{{sfn|PLUS|1972|p=3-19}} Instead, the {{code|UNTIL}} and {{code|WHILE}} keywords could be used to control early exits. For instance, {{code|1 = FOR I=1 UNTIL I=10|lang=basic}} continue looping until I=10, with the assumption that following code would set the value of I,{{sfn|PLUS|1972|p=8-14}} meaning it might not exit after 10 iterations but as soon as the code set I to 10.{{sfn|PLUS|1972|p=8-15}} Modifiers could also be used to build compact one-line loops, for instance, {{code|1 = X=X+1 WHILE X<100|lang=basic}} would loop until X was 100.{{sfn|PLUS|1972|p=8-20}}