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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.
$INCREMENT and Global Variables
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Zipper Business High Long Purse Wallet Capacity Organizer Wallets Coffee Coin Card Bag Leather Male Men Holder Arichtop WRITE "E18 :",x,!
WRITECoin Card Organizer Arichtop Long Bag Coffee Male Leather Purse Men Holder Capacity Business Wallets Zipper Wallet High "E18+1 :",$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),Long Wallet Leather Men Wallets Zipper Organizer Capacity Card High Business Coffee Bag Purse Coin Arichtop Male Holder !
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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 !,Organizer Holder Bag Purse Capacity Coin Long Arichtop Business Wallets Card High Male Men Coffee Wallet Zipper Leather $INCREMENT(xyz,0) ; still zero
WRITE !,$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(Bag Coin Male High Long Coffee Zipper Wallet Leather Capacity Organizer Arichtop Men Holder Wallets Business Purse Card xyzCapacity Long High Business Male Coffee Wallet Men Bag Zipper Arichtop Leather Holder Coin Organizer Purse Wallets Card ,2)
; increments by 2
; null string increments by 0 (xyz=2)
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Male Organizer Purse Capacity Business Bag Long Arichtop Men Leather Coin Coffee High Wallets Card Holder Zipper Wallet ; increments by 3 (rest of string ignored)
; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)