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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.
$INCREMENT and Global Variables
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WRITELeather Notebook Bag Suitable Business First Leather Briefcase Bags Layer Men's Handbags Vintage Qi Leisure Business Casual Shoulder Men's For Satchel "E18+1 :",$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),Leather Bag For Bags Layer Men's Vintage Casual First Shoulder Notebook Leisure Leather Suitable Satchel Qi Briefcase Men's Business Handbags Business !
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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 !,Casual Leisure Handbags Men's Satchel Qi Notebook Leather Business Vintage For Men's Suitable Bags First Business Leather Layer Briefcase Shoulder Bag $INCREMENT(xyz,0) ; still zero
WRITE !,$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 !,$INCREMENT(Shoulder Business Layer Bags Satchel Leather Men's Briefcase Notebook Men's Leather Qi Vintage Bag First Suitable For Casual Handbags Leisure Business xyzBags Men's Suitable Leather Layer Bag Leisure Men's Business Shoulder Leather First Handbags Briefcase Satchel Qi For Casual Notebook Vintage Business ,2)
; increments by 2
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTthe comes Shopping Gym 42cm HippoWarehouse 10 Tote Burgundy Beach Bag bride Here litres x38cm 5YZqqwzXE(xyz,"3A4")
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; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)