# A CDE Definition

arithmetic operator

A symbol for a basic mathematical function:

**+**add,

**-**subtract,

*****multiply,

**/**divide. See precedence.

precedence

The order in which an expression is processed. Mathematical precedence is normally:

**1. unary + and - signs**

**2. exponentiation**

**3. multiplication and division**

**4. addition and subtraction**

In order to properly compute the formula that converts Fahrenheit to Celsius, which is

**fahrenheit-32*5/9**, the expression

**(fahrenheit-32)*5/9**

must be used with parentheses separating the fahrenheit-32 from the multiplication. Since multiplication is evaluated before subtraction, 32 would be multiplied by 5 first, which is not what is wanted.

Logical precedence is normally:

**1. NOT**

**2. AND**

**3. OR**

In the dBASE query:

**list for item = "TIE" .and.**

**color = "GRAY" .or. color = "RED"**

all gray ties and anything red will be selected, since ANDs are evaluated before ORs. Grouping the colors in parentheses as in the example below yields only gray and red ties.

**(color="GRAY" .or. color="RED")**

**Before/After Your Search Term**

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