BEGIN...END
The BEGIN...END statement defines a block of statements. A block of statements is a group of statements that is treated as a single statement. Blocks are necessary when more than one statement is the subject of a conditional or repetitive statement.
Syntax
BEGIN
statements
END | ENDIF | ENDELSE | ENDFOR | ENDFOREACH | ENDREP | ENDWHILE | ENDCASE | ENDSWITCH
The END identifier used to terminate the block should correspond to the type of statement in which BEGIN is used. The following table lists the correct END identifiers to use with each type of statement.
|
Statement |
END |
Example |
|
IF expression THEN BEGIN |
ENDIF |
IF (1) THEN BEGIN A=1 ENDIF |
|
ELSE BEGIN |
ENDELSE |
IF (0) THEN BEGIN A=1 ENDIF ELSE BEGIN A=2 ENDELSE |
|
FOR variable=init, limit DO BEGIN |
ENDFOR |
FOR i=1,5 DO BEGIN PRINT, array[i] ENDFOR |
|
FOREACH element, variable [, key] DO BEGIN |
ENDFOREACH |
arr = [1, 3, 5, 7, 9] FOREACH element, arr DO BEGIN PRINT, element ENDFOREACH |
|
REPEAT BEGIN |
ENDREP UNTIL |
REPEAT BEGIN A = A * 2 ENDREP UNTIL A GT B |
|
WHILE expression DO BEGIN |
ENDWHILE |
WHILE ~ EOF(1) DO BEGIN READF, 1, A, B, C ENDWHILE |
| CASE var OF |
ENDCASE |
CASE name OF ... ENDCASE |
|
case_expression: BEGIN |
END |
CASE name OF 'Moe': BEGIN PRINT, 'Stooge' END ENDCASE |
| SWITCH var OF | ENDSWITCH |
SWITCH name OF ... ENDSWITCH |
|
switch_expression: BEGIN |
END |
SWITCH name OF 'Moe': BEGIN PRINT, 'Stooge' END ENDSWITCH |
Version History
|
Original |
Introduced |
See Also
BREAK, CASE, CONTINUE, FOR, FOREACH, GOTO, IF...THEN...ELSE, REPEAT...UNTIL, SWITCH, WHILE...DO, IDL Programming