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abbreviations, REXX instructions are common words, such as SAY, PULL,
IF...THEN...ELSE, DO...END, and EXIT.
C.1.3 Fewer rules
REXX has relatively few rules about format. A single instruction can span
many lines, and you can include multiple instructions on a single line.
Instructions need not begin in a particular column and you can type them in
uppercase, lowercase, or mixed case. You can skip spaces in a line or entire
lines. There is no line numbering.
C.1.4 Interpreted, not compiled
REXX is an interpreted language. When a REXX program runs, its language
processor reads each statement from the source file and runs it, one
statement at a time. Languages that are not interpreted must be compiled
into object code before they can be run.
C.1.5 Built-in functions and methods
REXX has built-in functions and methods that perform various processing,
searching, and comparison operations for text and numbers and provide
formatting capabilities and arithmetic calculations.
C.1.6 Typeless variables
REXX regards all data as objects of various kinds. Variables can hold any
kind of object, so you need not declare variables as strings or as numbers.
C.1.7 String handling
REXX includes capabilities for manipulating character strings. This allows
programs to read and separate characters, numbers, and mixed input. REXX
performs arithmetic operations on any string that represents a valid number,
including those in exponential formats.
C.1.8 Clear error messages and powerful debugging
REXX displays messages with meaningful explanations when a REXX
program encounters an error. In addition, the TRACE instruction provides a
powerful debugging tool.
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