Advanced REXX Functions
As you become more skilled at programming, you may want to create procedures
that do more and run more efficiently. Sometimes this means adding a special
function to a procedure or calling a subroutine.
In this section, we shall see how these functions can help to build a better
foundation in REXX.
FunctionsReference
Perform
a computation and return a result.
DATATYPE( )Reference
An internal function that verifies that the
data is a specific type.
SUBSTR( )Reference
An internal function that selects part of a
string.
CALLReference
Causes the procedure to look for a subroutine
label and begin running the instructions following the label.
REXX.CMD
File CommandsReference
Treat
commands as expressions.
Error MessagesReference
Tell you if the command runs correctly. If the
procedure runs correctly, no message is displayed.
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