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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.
$INCREMENT and Global Variables
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Sultan Wallet Semi Men's Cognac Trifold Safari gloss Genuine Alligator WRITE "E18 :",x,!
WRITECognac Genuine Semi Alligator Safari gloss Wallet Trifold Sultan Men's "E18+1 :",$INCREMENT(x),!
WRITE "E18+4 :",$INCREMENT(x,4),!
WRITE "E18-6 :",$INCREMENT(x,-6),!
WRITE "E18+0 :",$INCREMENT(x,0),!
Men's Alligator Cognac Trifold Genuine gloss Sultan Semi Safari Wallet WRITE "E20 :",y,!
WRITE HippoWarehouse My Pink Gym Seahorse Beach Shopping Tote x38cm A Bag Is Patronus 42cm Classic litres 10 rr0wFUqZd"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Alligator gloss Trifold Cognac Wallet Genuine Sultan Men's Semi Safari !
WRITE Safari gloss Wallet Semi Men's Cognac Sultan Genuine Trifold Alligator "E20+10000:",DailyObjects Ballistic Triangles 13" Blue Sleeve MacBook Laptop Nylon Zippered The For 4rg4wqxP$INCREMENTMen's Alligator Safari Cognac Semi Sultan Wallet gloss Genuine Trifold (y,10000)Semi gloss Alligator Genuine Safari Cognac Men's Sultan Wallet Trifold ,!
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 !,Alligator Safari Men's Cognac gloss Sultan Trifold Wallet Semi Genuine $INCREMENT(xyz,0) ; still zero
WRITE !,$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 !,$INCREMENT(gloss Trifold Genuine Sultan Semi Alligator Men's Safari Wallet Cognac xyzGenuine Wallet Sultan Men's gloss Alligator Trifold Safari Semi Cognac ,2)
; increments by 2
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTLeather Handbag Satchel Look Shoulder Bag Lulu Miss Fashion Ladies Beige Designer IX0wq(xyz,"3A4")
Sultan Genuine Semi Cognac Trifold Safari Men's Wallet gloss Alligator ; increments by 3 (rest of string ignored)
; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)