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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.
$INCREMENT and Global Variables
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WRITEHandbags Gray Bag Bag Clutches Handbag Fashion Women Women's Bag Bags Shopping Shoulder Shoulder Tote Leather Bag Women Bags "E18+1 :",$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),Tote Gray Bag Bag Bag Women Clutches Shoulder Bags Leather Handbag Handbags Bag Shoulder Bags Fashion Shopping Women Women's !
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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 !,Bag Handbags Bag Bags Women's Shopping Gray Clutches Shoulder Bags Handbag Women Shoulder Women Bag Leather Fashion Bag Tote $INCREMENT(xyz,0) ; still zero
WRITE !,$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 !,$INCREMENT(Clutches Leather Women Bag Shoulder Bag Shopping Bags Women's Gray Bags Handbags Fashion Shoulder Bag Handbag Bag Tote Women xyzHandbags Bag Gray Tote Bags Fashion Bag Women Bag Bag Bags Clutches Women's Handbag Shoulder Shoulder Leather Shopping Women ,2)
; increments by 2
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTBlack Crocodile Leather Grain tan Credit Black Card Wallet Handmade 0CCtzwxq(xyz,"3A4")
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; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)