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7.4.5 += Operator

Used to increment a variable by a specified amount
 

Syntax

result += expression

Arguments

result
Any variable.
expression
Any expression

Remarks

Using this operator is exactly the same as specifying:
 

result = result + expression

The underlying subtype of the expression determines the behavior of the += operator:
 

If Then
Both expressions are numeric or Boolean
 
Add
 
Both expressions are strings
 
Concatenate
 
One expression is numeric and the other is a string
 
Concatenate
 
For information on when a run-time error is generated by the += operator, see the Operator Behavior table.
 


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