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
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
Identifier
|
Example |
|
ELSE BEGIN |
ENDELSE |
IF (0) THEN A=1 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
|
|
IF expression THEN BEGIN
|
ENDIF |
IF (0) THEN BEGIN
A=1
ENDIF
|
|
REPEAT BEGIN |
ENDREP |
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
|
|
LABEL: BEGIN
|
END |
LABEL1: BEGIN
PRINT, A
END
|
|
case_expression: BEGIN
|
END |
CASE name OF
'Moe': BEGIN
PRINT, 'Stooge'
END
ENDCASE
|
|
switch_expression: BEGIN
|
END |
SWITCH name OF
'Moe': BEGIN
PRINT, 'Stooge'
END
ENDSWITCH
|
CASE and SWITCH also have their own END identifiers. CASE should always be ended with ENDCASE, and SWITCH should always be ended with ENDSWITCH.
Version History
See Also
BREAK, CASE,
CONTINUE, FOR,
FOREACH, GOTO,
IF...THEN...ELSE,
REPEAT...UNTIL,
SWITCH,
WHILE...DO,IDL Programming