# What are Numeric expressions?

Unless otherwise stated in this manual, expressions refer to numeric expressions which consist of elements (attributes, variables, distributions, and constants) combined with normal mathematical operators ( + , – , etc.) that result in a numeric value. A numeric expression may be as simple as a variable name or as complex as a formula.

#### Expression Elements

The following table illustrates the expression elements.

#### Mathematical Operators

The following table illustrates the use of mathematical operators.

#### Examples of Numeric Expressions

You may combine items to form a compound expression. Parentheses may be used to set off parts of the expression to be evaluated first. For information on the order in which operators are evaluated to determine the expression’s value, see Operator Precedence below.

a_Attr1
50.91
v_Var1 + 5
v_Total_Pieces + 5 * a_Pkg_Qty
(a_Weight + 5) * (a_Pkg_Qty / 2)
N(25, 4.8) + a_Weight * (v_Total_Pieces – 10)

What are Boolean expressions?