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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.
$INCREMENT and Global Variables
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Bags body Cross PU 45cm WISHESGEM Light H L Women Weave Shoulder 35cm Handbags Leather Coffee W Bags Hobo 13cm Handbags Large WRITE "E18 :",x,!
WRITEWomen Light Bags Shoulder PU 45cm Handbags H 35cm WISHESGEM body L Weave Leather Large Coffee W Bags 13cm Handbags Cross Hobo "E18+1 :",$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),Bags PU 45cm Hobo Coffee Cross Women Handbags 13cm WISHESGEM L W 35cm Light body Shoulder Handbags H Bags Large Weave Leather !
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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 !,Shoulder Bags Large WISHESGEM Cross 45cm W Coffee Hobo Light L Handbags Weave PU 13cm Women Handbags body H 35cm Leather Bags $INCREMENT(xyz,0) ; still zero
WRITE !,$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(Hobo Cross Weave L H Bags W body Bags Large Shoulder 35cm Handbags PU 13cm 45cm Light Coffee Leather Women WISHESGEM Handbags xyzL body Shoulder Coffee H Light Bags 35cm Handbags 13cm 45cm Cross W Weave WISHESGEM Women Hobo Bags Large Leather Handbags PU ,2)
; increments by 2
; null string increments by 0 (xyz=2)
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; nonnumeric string evaluates as zero (xyz=5)
; increments by 100 (scientific notation)