+ operator

Used to sum two numbers.

Syntax

result = expression1+expression2

The + operator syntax has these parts:

Part	Description
result	Any numeric variable.
expression1	Any expression.
expression2	Any expression.

Remarks

Use the & operator for concatenation to eliminate ambiguity and provide self-documenting code.

When you use the + operator, you may not be able to determine whether addition or string concatenation will occur. If at least one expression is not a Variant, the following rules apply:

Operation performed	If
Add	Both expressions are numeric data types (Byte, Boolean, Integer, Long, Single, Double, Date, or Currency)
Concatenate	Both expressions are String
Add	One expression is a numeric data type and the other is any Variant except Null
Concatenate	One expression is a String and the other is any Variant except Null
Return the remaining expression unchanged as result	One expression is an Empty Variant
A `Type mismatch` error occurs	One expression is a numeric data type and the other is a String
result is Null	Either expression is Null

If both expressions are Variant expressions, the following rules apply:

Operation performed	If
Add	Both Variant expressions are numeric
Concatenate	Both Variant expressions are strings
Add	One Variant expression is numeric and the other is a string

For simple arithmetic addition involving only expressions of numeric data types, the data type of result is usually the same as that of the most precise expression. The order of precision, from least to most precise, is Byte, Integer, Long, Single, Double, and Currency. The following are exceptions to this order:

When a Single and a Long are added together, the data type of result is converted to a Double.
When the data type of result is a Long, Single, or Date variant that overflows its legal range, result is converted to a Double variant.
When the data type of result is a Byte variant that overflows its legal range, result is converted to an Integer variant.
When the data type of result is an Integer variant that overflows its legal range, result is converted to a Long variant.
When a Date is added to any data type, the data type of result is always a Date.

Note The order of precision used by addition and subtraction is not the same as the order of precision used by multiplication.

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