System Function EM

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⎕EM - Error Message

⎕EM Return the value of the current error message

⎕EM is an ISO 13751 standard niladic system function which returns the current error message. This is an array of three strings. The first element is the text of the error message itself, in all upper case. The second element is the line typed in or the line of the function where the error occurred. The third element is usually a caret (^) pointing to where the error in the line shown in the second element occurred.

The format of ⎕EM is implementation dependent. Here is an example from NARS2000 on an attempt to make 2+2 = 5:
      a←2+2
      a
4
      5←2+2
SYNTAX ERROR
      5←2+2
       ∧
      a
4
      ⎕EM
SYNTAX ERROR
      5←2+2
       ∧


Note: EM is a niladic form system function, you cannot assign a value to it.

System Variables (A value may be assigned to these except for ⎕DM)
ALX CT DM DT ELX FC FEATURE FPC IC IO
LX PP PR PW RL SA WSID
Niladic System Functions (a value cannot be assigned to these)
A AV EM ET LC NNAMES NNUMS SYSID SYSVER T
TC TCBEL TCBS TCESC TCFF TCHT TCLF TCNL TCNUL TS
WA
Monadic or dyadic system functions (a value cannot be assigned to these)
AT CR DC DL DR EA EC ERROR ES EX
FMT FX MF NAPPEND NC NCREATE NERASE NINFO NL NLOCK
NREAD NRENAME NREPLACE NRESIZE NSIZE NTIE NUNTIE STOP TF TRACE
UCS VR
Note that quad functions and variables are case insensitive


See Also
System Commands System Variables and Functions Operators
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NARS 2000 Lang
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