HP 50g Graphing, 48gII Graphing manual ERR0, Errm, Errn, Euler

ERR0

Type:	Command
Description:	Clear Last Error Number Command: Clears the last error number so that a subsequent execution
	of ERRN returns # 0h, and clears the last error message.
Access:	!°LLERROR ERR0		( °is the leftshift of the		Nkey).
Input/Output:	None
See also:	DOERR, ERRM, ERRN
ERRM	Command
Type:
Description:	Error Message Command: Returns a string containing the error message of the most recent
	calculator error.
	ERRM returns the string for an error generated by DOERR. If the argument to DOERR was 0,
	the string returned by ERRM is ‘Interrupted’.
Access:	!°LLERROR ERRM		( °is the leftshift of the		Nkey).
Input/Output:
		Level 1/Argument 1		Level 1/Item 1
			→	“error message”
	The program
Example:		« IFERR + THEN ERRM END » returns "Bad Argument Type" to level 1
	if improper arguments (for example, a complex number and a binary integer) are in levels 1 and 2.
See also:	DOERR, ERRN, ERR0
ERRN	Command
Type:
Description:	Error Number Command: Returns the error number of the most recent calculator error.
	If the most recent error was generated by DOERR with a string argument, ERRN returns
	#70000h. If the most recent error was generated by DOERR with a binary integer argument,
	ERRN returns that binary integer. (If the most recent error was generated by DOERR with a real
	number argument, ERRN returns the binary integer conversion of the real number.) The only
	exceptions to these rules are 0 DOERR and #0 DOERR, both of which set ERRN to #31Fh and
	ERRM to ‘Interrupted’.
Access:	!°LLERROR ERRN		( °is the leftshift of the		Nkey).
Input/Output:
		Level 1/Argument 1		Level 1/Item 1
			→		#nerror
Example:	The program « IFERR + THEN ERRN END » returns # 202h to level 1 if improper
	arguments (for example, a complex number and a binary integer) are in levels 1 and 2.
See also:	DOERR, ERRM, ERR0
EULER
Type:	Function
Description:	For a given integer, returns the number of integers less than the integer that are coprime with the
	integer. (Euler’s Φ function.)
Access:	!ÞINTEGER
Input:	A nonnegative integer, or an expression that eval uates to a nonnegative integer.
Output:	The number of positive integers, less than, and coprime with, the integer.
Flags:	Exact mode must be set (flag –105 clear).
	Numeric mode must not be set (flag –3 clear).

376 Full Command and Function Reference