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.help clarg Sep86 imfort
.ih
NAME
clarg -- fetch and decode the value of a command line argument
.ih
SYNOPSIS
.nf
subroutine clargc (argno, cval, ier)
subroutine clargi (argno, ival, ier)
subroutine clargr (argno, rval, ier)
subroutine clargd (argno, dval, ier)
integer argno #I index of argument to be decoded
integer ier #O status return
character*(*) cval #O string value of argument
integer ival #O integer value of argument
real rval #O real value of argument
doubleprecision dval #O double value of argument
.fi
.ih
DESCRIPTION
The four \fIclarg\fR procedures are used to fetch and decode the value of
the indexed command line argument; the first argument is number one.
Any argument may be returned as a string with \fIclargc\fR.
Numeric arguments are decoded using the IRAF formatted i/o primitives,
hence octal constants (`B' suffix), hex constants (`X' suffix),
and sexagesimal numbers are all legal as input.
.ih
RETURN VALUE
A status of zero indicates that the indexed argument was present on the
command line and could be decoded in the manner specified.
.nf
IE_GCMDLN: cannot read command line string
IE_NEXARG: nonexistent command line argument referenced
IE_NONNUMARG: command line argument cannot be decoded as a number
.fi
.ih
SEE ALSO
clnarg, clrawc
.endhelp
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