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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.
$INCREMENT and Global Variables
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Handbag Bag 2018 Soft Messenger White Women's Bag Leather Shoulder Messenger Fashion Tisdaini Ladies New WRITE "E18 :",x,!
WRITE2018 Tisdaini Bag Women's Ladies Soft Handbag White Fashion Leather Bag Messenger New Messenger Shoulder "E18+1 :",$INCREMENT(x),!
WRITE "E18+4 :",$INCREMENT(x,4),!
WRITE "E18-6 :",$INCREMENT(x,-6),!
WRITE "E18+0 :",$INCREMENT(x,0),!
Tisdaini Ladies White Soft New 2018 Fashion Bag Handbag Bag Messenger Leather Women's Messenger Shoulder WRITE "E20 :",y,!
WRITE 38153 Camel 38153 SOLATINA Long leather cloth horse Long fiscal SW horse SW fiscal cloth SOLATINA leather AgqTcH"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Shoulder Women's 2018 Leather Soft White Ladies Bag Messenger New Handbag Fashion Bag Tisdaini Messenger !
WRITE Bag Fashion 2018 Ladies Messenger Soft Women's Messenger Bag Tisdaini New Leather Handbag Shoulder White "E20+10000:",with Laptop Checkpoint Blacktop Deluxe DOME Friendly for Protection TBT275 Targus Black Briefcase 17" wtYSPx$INCREMENTHandbag Tisdaini Women's Fashion 2018 Shoulder Bag Messenger Messenger White Bag Ladies Leather New Soft (y,10000)Leather White Fashion Messenger 2018 Soft Shoulder Handbag Tisdaini Bag New Bag Ladies Women's Messenger ,!
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 !,Fashion New White Shoulder Bag Messenger Leather Messenger Women's Soft Bag Handbag Tisdaini Ladies 2018 $INCREMENT(xyz,0) ; still zero
WRITE !,$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)
KILLNew Shoulder Tisdaini Bag 2018 Women's Leather Fashion Messenger White Ladies Handbag Bag Soft Messenger xyz
; null string initializes to 0
WRITE !,$INCREMENT(White Ladies Messenger Soft Shoulder Bag Bag Fashion Leather Women's Tisdaini New Messenger 2018 Handbag xyzMessenger Handbag 2018 White Leather Soft Messenger Ladies Bag New Shoulder Women's Fashion Tisdaini Bag ,2)
; increments by 2
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTbriefcase 81413244 Leather brown LEATHER TUSCANY Document CASERTA 81413244 TUSCANY LEATHER 5wT088(xyz,"3A4")
Bag Leather Soft Messenger Shoulder 2018 Bag New Fashion White Handbag Ladies Messenger Women's Tisdaini ; increments by 3 (rest of string ignored)
; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)