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Addition Operator (+) (VBScript)

Sums two numbers.

result = expression1 + expression2


Any numeric variable.


Any expression.


Any expression.

Although you can also use the + operator to concatenate two character strings, you should use the & operator for concatenation to eliminate ambiguity. When you use the + operator, you may not be able to determine whether addition or string concatenation will occur.

The type of the expressions determines the behavior of the + operator in the following way:



Both expressions are numeric


Both expressions are strings


One expression is numeric and the other is a string

Error: type mismatch

If one or both expressions are Null expressions, result is Null. If both expressions are Empty, result is an Integer subtype. However, if only one expression is Empty, the other expression is returned unchanged as result.

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