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PRM( ) |
Return Parameter Value |
PRM(param[,ERR=stmtref])
Where:
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param |
Two-character valid system parameter code, enclosed in single quotes. See System Parameters. String expression. |
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stmtref |
Program line number or statement label to which to transfer control. |
Current value of system parameter, or status code if switch.
The PRM( ) function returns the current value of the specified system parameter unless the parameter is a switch. The following numeric status codes are returned for a switch:
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0 |
If the switch is Off |
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1 |
If the switch is On |
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-1 |
If the specified parameter does not exist |
SET_PARAM Set System Parameters
This temporarily changes the 'BY' parameter to obtain a new date:
print "Valentine days.."
SV_BY=prm('BY')
for Y=1999 to 2009
set_param 'BY'=Y
print dte(31+14-1:"%Dl %Ml %D/%Y")
next Y
set_param 'BY'=SV_BY
->run
Valentine days..
Sunday February 14/1999
Monday February 14/2000
Wednesday February 14/2001
Thursday February 14/2002
Friday February 14/2003
Saturday February 14/2004
Monday February 14/2005
Tuesday February 14/2006
Wednesday February 14/2007
Thursday February 14/2008
Saturday February 14/2009
PRM( ) returns a specific parameter's current setting (or the Boolean value for a switch):
?prm('AH')
0
set_param 'AH'
?prm('AH')
1
The parameter's status is returned even when it is hidden from the PRM variable's contents listing:
?prm('!I') ! hidden unless ON
0