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逻辑IF

Synopsis

IF/logical expression,statement

Description

This statement provides for the execution or exclusion of a statement based on the results of a logical expression. If the results of the logical comparison is true, for example: does 1 equal 1, IF/1==1, the following statement is executed. If the results of the logical comparison is false, for example: does 1 equal 2, IF/1==2, the following statement is not executed.

The order of evaluation for the arithmetic and logical operators is important in obtaining the desired results.

Order	Operator
First	Arithmetic Operators: + Addition - Subtraction * Multiplication / Division ** Exponentiation
Second	Logical Operators: == Equal to <> Not equal to < Less than <= Less than or equal to >= Greater than or equal to
Third	Boolean Operator: NOT Complement
Fourth	Boolean Operators: AND Both OR Either

Parameters

Parameter

Description

logical expression

A logical expression which consists of two values separated by a logical operator. The expression may consist of any combination of constants and numerical variables or any combination of string literals and string variables. The following table is a list of logical operators which perform the comparisons (the symbols < and > represent the less than and greater than symbols respectively). NOTE: EDAs are not allowed in logical expression.

Operator	Comparison
==	Equal to
<>	Not equal to
<	Less than
<=	Less than or equal to
>	Greater than
>=	Greater than or equal to

statement

Any executable GRIP statement such as: JUMP/label: A=1 DELETE/LN1 Exceptions are: DO and DECLARATION statements.