Reference Guide

RPL Programming Examples 2-27
Program: Comments:
argm TYPE 6. SAME NOT
THEN
"Not name or list"
DOERR
END
Tests if the argument is not a name. If so,
displays an error message and aborts
execution.
END
Ends the CASE structure.
»
Ends the defining procedure.
»
`O VFYK
Enters the program, then stores it in VFY.
Checksum: # 31403d
Bytes: 139.5
Example: Execute VFY to test the validity of the name argument BEN. (The argument is valid and is simply
returned to the stack.)
OBEN `
J %VFY%
Example: Execute VFY to test the validity of the list argument {BEN JEFF SARAH }. Use the name from the
previous example, then enter the names JEFF and SARAH and convert the three names to a list.
OJEFF `
OSARAH `
3 !° %LIST% %²LIST%
Execute VFY. Since the list contains too many names, the error message is displayed and execution is aborted.
J %VFY%
Converting Procedures from Algebraic to RPN
This section contains a program, →RPN, that converts an algebraic expression into a series (list) of objects in
equivalent RPN order.
Level 1
→
Level 1
‘symb’
→
{ objects }