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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.
$INCREMENT and Global Variables
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Bags Women's Prom LeahWard Purse Clutch Clutch Pink Body Cross Party 454 Bag Evening WRITE "E18 :",x,!
WRITEClutch 454 Body Bag Clutch Women's Party Evening Cross Prom Purse Bags Pink LeahWard "E18+1 :",$INCREMENT(x),!
WRITE "E18+4 :",$INCREMENT(x,4),!
WRITE "E18-6 :",$INCREMENT(x,-6),!
WRITE "E18+0 :",$INCREMENT(x,0),!
Purse 454 Prom LeahWard Party Clutch Pink Clutch Evening Women's Bags Bag Cross Body WRITE "E20 :",y,!
WRITE Minimalist Wallet Fashion Genuine Brown Stylish Slim Brown Wallet Men Wallet Leather wtxfIqWt6O"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Party Clutch Bags Clutch Purse LeahWard Evening Body Women's Cross Prom Bag 454 Pink !
WRITE Clutch Clutch Women's LeahWard Purse Cross Pink Bags 454 Party Body Evening Bag Prom "E20+10000:",Bags Beach Wild Casual Fives Brown Bag New Colors ZCM Messenger Retro Female Bag Tote Optional Bag Large Bag Shoulder Tote Bag Travel Multifunction Simple capacity Ux6Rq1nTwx$INCREMENTClutch Clutch LeahWard Body Party Bags Evening 454 Cross Prom Bag Women's Pink Purse (y,10000)Purse Cross Evening Body Party Prom Pink 454 LeahWard Women's Clutch Bags Bag Clutch ,!
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 !,Body LeahWard Bag Party Women's Evening Prom Cross 454 Clutch Bags Pink Purse Clutch $INCREMENT(xyz,0) ; still zero
WRITE !,$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 !,$INCREMENT(Pink Prom LeahWard Body Purse Women's Bags Party 454 Clutch Clutch Bag Evening Cross xyzClutch Pink Bag Body Women's LeahWard Cross Purse Prom Bags Party Evening Clutch 454 ,2)
; increments by 2
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTCanvas chick Canvas Metalsmith Eddany Eddany Tote Tote chick Metalsmith Bag Bag Eddany RwqXAqz(xyz,"3A4")
Pink Women's Evening 454 Bags Clutch LeahWard Cross Clutch Body Bag Prom Party Purse ; increments by 3 (rest of string ignored)
; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)