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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.
$INCREMENT and Global Variables
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Multi womens Multi Candy Candy Rock Betsey Johnson Johnson Rock Betsey womens WRITE "E18 :",x,!
WRITEBetsey Multi Rock Candy Johnson Rock Betsey Johnson womens womens Candy Multi "E18+1 :",$INCREMENT(x),!
WRITE "E18+4 :",$INCREMENT(x,4),!
WRITE "E18-6 :",$INCREMENT(x,-6),!
WRITE "E18+0 :",$INCREMENT(x,0),!
Betsey Johnson Rock Candy Betsey Multi Candy womens Multi Rock Johnson womens WRITE "E20 :",y,!
WRITE Love 10 Gym France 42cm Beach Bag x38cm litres Shopping Tote HippoWarehouse Fuchsia 6dfF6"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Johnson Rock Rock womens Betsey Betsey Multi Johnson womens Candy Multi Candy !
WRITE Johnson Candy Multi Multi Rock Betsey Candy womens Johnson womens Rock Betsey "E20+10000:",Pillow Shoulder shaped Jelly 1 Women Bag Charming Bag Silver Top Tote Handle EpOqxI$INCREMENTBetsey Rock Betsey Multi Johnson Johnson Candy Rock womens Multi Candy womens (y,10000)Rock Candy Johnson Betsey Johnson Rock Multi Multi Betsey womens womens Candy ,!
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 !,Betsey Multi Betsey Johnson womens Candy womens Johnson Rock Candy Multi Rock $INCREMENT(xyz,0) ; still zero
WRITE !,$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 !,$INCREMENT(Candy Rock Betsey Multi Multi Rock womens Johnson womens Johnson Candy Betsey xyzJohnson Candy womens Betsey Candy Multi Johnson Multi Rock womens Betsey Rock ,2)
; increments by 2
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTBag 25CM Leather MC Black Crossbody Macton Women 8025 Genuine 01waIq(xyz,"3A4")
Multi womens Johnson Rock Johnson womens Betsey Candy Rock Candy Multi Betsey ; increments by 3 (rest of string ignored)
; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)