0.9b (c) 1995 Peter Childs
Some features of REXX that you can use to write more intricate procedures will be discussed in this section. You will see how to have a procedure make decisions by testing a value with the IF instruction. You will also see how to compare values and determine if an expression is true or false. A brief description of the terms covered in this section follows below:
IF Used with THEN. Checks if the expression is true. Makes a decision about a single instruction.
THEN Identifies the instruction to be run if the expression is true.
ELSE Identifies the instruction to be run if the expression is false.
SELECT Tells the interpreter to select one of a number of instructions.
WHEN Used with SELECT. Identifies an expression to be tested.
OTHERWISE Used with SELECT. Indicates the instruction to be run if expressions tested are false.
DO-END Indicates that a group of instructions should be run.
NOP Indicates that nothing is to happen for one expression.
Comparisons > < = Indicates greater than, less than, equal to.
NOT Operator ¬ or \ Changes the value of a term from true to false, or from false to true.
AND Operator & Gives the value of true if both terms are true.
OR Operator | Gives the value of true unless both terms are false.
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