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Adds a specified increment to the numeric value of a variable.
WRITE !,result /* result is 8 (a+1) */
WRITE !,a /* variable a is also now 8 */
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You can use the
function to return the current value of a variable.
$INCREMENT and Global Variables
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Bags W Women 45cm Light Bags Shoulder Cross Large Weave 13cm Handbags Handbags body Coffee Hobo WISHESGEM PU Leather 35cm H L WRITE "E18 :",x,!
WRITEHandbags 13cm W Handbags Bags body Bags Shoulder 45cm PU WISHESGEM L Hobo Cross 35cm Light Coffee Weave Women Leather H Large "E18+1 :",$INCREMENT(x),!
WRITE "E18+4 :",$INCREMENT(x,4),!
WRITE "E18-6 :",$INCREMENT(x,-6),!
WRITE "E18+0 :",$INCREMENT(x,0),!
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WRITE "E20-10000:",$INCREMENT(y,-10000),13cm PU Large Coffee L Handbags Weave Leather Women Bags 45cm Cross H Hobo W 35cm Bags body Shoulder Handbags WISHESGEM Light !
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WRITE "E20+1 :",$INCREMENT(y),!
Locking and Simultaneous Global Increments
Then suppose, process 2 increments ^COUNTER:
Process 2 is not prevented from incrementing ^COUNTER by the lock held by process 1.
$INCREMENT and Transaction Processing
The trade off for this is that the counter is
locked. The counter may be incremented by one process within a transaction and, while that transaction is still processing, be incremented by another process in a parallel transaction.
The following example increments the value of
. Note that
does not have to be a prior defined variable:
WRITE !,$INCREMENT(^||xyz) ; returns 1
WRITE !,$INCREMENT(^||xyz) ; returns 2
WRITE !,$INCREMENT(^||xyz) ; returns 3
WRITE !,$INCREMENT(^||xyz,3.14) ; returns 6.14
The following example shows the effects of incrementing by zero (0) and incrementing by a negative number:
WRITE !,$INCREMENT(xyz,0) ; initialized as zero
WRITE !,Coffee W 45cm Shoulder Bags H body Handbags Hobo Leather Handbags L PU 13cm Bags Cross Large 35cm Light Women Weave WISHESGEM $INCREMENT(xyz,0) ; still zero
WRITE !,$INCREMENT(xyz) ; increments by 1 (default)
WRITE !,$INCREMENT(xyz) ; increments by 1 (=2)
WRITE !,$INCREMENT(xyz,-1) ; decrements by -1 (=1)
WRITE !,$INCREMENT(xyz,-1) ; decrements by -1 (=0)
WRITE !,$INCREMENT(xyz,-1) ; decrements by -1 (=-1)
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; null string initializes to 0
WRITE !,$INCREMENT(PU Light L Cross Coffee Handbags Hobo WISHESGEM Bags Leather Shoulder Bags Women body Large H Weave Handbags 13cm W 35cm 45cm xyzWISHESGEM PU Hobo Large Leather body Bags 13cm Women H Weave Handbags 35cm Coffee Light Handbags Bags Shoulder L W 45cm Cross ,2)
; increments by 2
; null string increments by 0 (xyz=2)
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; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)