Skip to main content

This is documentation for Caché & Ensemble. See the InterSystems IRIS version of this content.

For information on migrating to InterSystems IRIS, see Why Migrate to InterSystems IRIS?

Addition Operator (+)

Used to sum two numbers.

Synopsis

result = expression1 + expression2

Arguments

The + operator syntax has these parts:

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

Description

Although you can also use the + operator to concatenate two character strings, you should 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.

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

If Then
Both expressions are numeric Add.
Both expressions are strings Concatenate.
One expression is numeric and the other is a string Add.

Notes

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.

See Also

Feedback