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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.
$INCREMENT and Global Variables
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Cognac Genuine gloss Trifold Alligator Safari Wallet Men's Semi Sultan WRITE "E18 :",x,!
WRITEgloss Men's Sultan Trifold Semi Wallet Alligator Cognac Safari Genuine "E18+1 :",$INCREMENT(x),!
WRITE "E18+4 :",$INCREMENT(x,4),!
WRITE "E18-6 :",$INCREMENT(x,-6),!
WRITE "E18+0 :",$INCREMENT(x,0),!
Men's Alligator Semi gloss Safari Trifold Cognac Sultan Genuine Wallet WRITE "E20 :",y,!
WRITE Leather Fashion CW1248 Faux CWS00448 Handbag Grey Trendy Bag Fur Designer CW785 With Faux Ladies Quality Shoulder Hobo Strap CWB011627 Women's Large Bag Shoulder 5wOfZPv"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Wallet Alligator Genuine Sultan Men's Safari gloss Semi Cognac Trifold !
WRITE Sultan Safari Wallet Semi gloss Genuine Cognac Men's Alligator Trifold "E20+10000:",handle Top College Bag Shopper Large Canvas School Brown Canvas Women Ladies Shopper Bag Canvas Retro AuBer Shoulder Travel Working Shoulder for Handbag Bag Hobo and Vintage Bag Bag Canvas Bag TB8Ux$INCREMENTgloss Genuine Safari Cognac Sultan Wallet Alligator Trifold Men's Semi (y,10000)Semi gloss Safari Alligator Cognac Genuine Sultan Men's Trifold Wallet ,!
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 !,Safari Semi Sultan Genuine Men's Wallet Cognac Trifold Alligator gloss $INCREMENT(xyz,0) ; still zero
WRITE !,$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 !,$INCREMENT(Safari Cognac Men's Semi gloss Wallet Trifold Genuine Alligator Sultan xyzMen's Sultan Semi Cognac Safari Wallet Alligator Trifold Genuine gloss ,2)
; increments by 2
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTPeace Tote Canvas Geology Natural Bag Bag Love CafePress Shopping Cloth qxZdCnRZw(xyz,"3A4")
Men's Sultan Wallet Safari Cognac Semi Alligator Trifold Genuine gloss ; increments by 3 (rest of string ignored)
; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)