HP 49g+ - Manual (Page 710)

Page 21-65
ERRM
This function returns a character string representing the error message of the
most recent error. For example, in Approx mode, if you try
0Y$@ERRM,
you get the following string: “Infinite Result”
ERR0
This function clears the last error number, so that, executing ERRN afterwards,
in Approx mode, will return # 0h. For example, if you try
0Y$@ERR0 @ERRN, you get # 0h. Also, if you try
0Y$@ERR0 @ERRM, you get the empty string “ “.
LASTARG
This function returns copies of the arguments of the command or function
executed most recently. For example, in RPN mode, if you use:
3/2`, and then use function LASTARG (@LASTA), you will get the
values 3 and 2 listed in the stack. Another example, in RPN mode, is the
following:
5U`. Using LASTARG after these entries produces a 5.
Sub-menu IFERR
The @)IFERR sub-menu provides the following functions:
These are the components of the IFERR … THEN … END construct or of the
IFERR … THEN … ELSE … END construct. Both logical constructs are used
for trapping errors during program execution. Within the
@)ERROR sub-menu,
entering „@)IFERR, or ‚@)IFERR, will place the IFERR structure components in
the stack, ready for the user to fill the missing terms, i.e.,
The general form of the two error-trapping constructs is as follows: