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+.help declarations Feb86 language
+.ih
+NAME
+declarations -- parameter and variable declarations
+.ih
+SYNTAX
+.nf
+vartype [*]varname[index_list] [= init_value] [{options}] [, ...]
+
+  or
+
+vartype [*]varname[index_list] [{init_value [, options]}] [, ...]
+.fi
+.ih
+ELEMENTS
+.ls vartype
+One of the legal variable types, i.e.:
+
+	int, bool, char, real, gcur, imcur, struct, file
+.le
+.ls varname
+The name of the variable or parameter.  The name must begin with
+an alphabetic character or '_' and should be fewer than 64 characters
+in length.  If the name is preceded by a '*', then the variable
+is 'list-directed', meaning that a new value is taken from a list
+each time the parameter is read.
+.le
+.ls index_list
+The index_list consists of a series of ranges enclosed in square brackets.
+A range may be a single integer in which case the range is from 1 to
+that integer, or two integers separated by a colon.  The second integer
+must be larger than the first.  Ranges are separated by commas. In
+the special case that no ranges are specified by the user, the variable
+is assumed to be a one-dimensional array with a  range from 1 to the
+number of elements in the initialization list.
+.le
+.ls init_value
+The initialization value is a single value for scalar parameters but
+may be a list for array.  A repetition count may be specified in the form
+
+	rep_count (value)
+
+
+which is equivalent to value repeated the rep_count times.
+The values in the initialization list are separated by commas.
+.le
+.ls options
+.br
+Options define certain characteristics of the variables.  Each
+options has the form opt_name=value where value is a constant.
+The current options are:
+.ls mode
+Determines whether the parameter is queried for and whether
+it is learned after task execution.  The default mode for parameters
+declared in the argument list of a CL procedure is "a", and "h" otherwise.
+.le
+.ls min
+The minimum allowable value for the parameter.  If omitted, no min checking
+is performed.
+.le
+.ls max
+The maximum allowable value for the parameter.  If omitted, no max checking
+is performed.
+.le
+.ls prompt
+.br
+The prompt to be used when the parameter is queried for.
+.le
+.ls enum
+The set of allowable string values for a string valued parameter.
+The character '|' delimits successive enumerated strings.
+.le
+.ls filetype
+For a \fIfile\fR type parameter, a string containing characters giving
+file characteristics to be checked for when the file parameter is used.
+.ls
+.nf
+r	file exists and is readable
+w	file exists and is writable
+n	file does not exist
+b	file is a binary file
+t	file is a text file
+.fi
+.le
+.le
+.ls length
+For a string type parameter, the number of characters of storage to
+allocate for the string.  If the actual length of a string later exceeds
+the allocated value the string will be silently truncated.
+.le
+
+Note that all string constants in an options list must be enclosed in
+quotes.
+.le
+
+.ih
+DESCRIPTION
+Declaration statements are used for inline declaration of parameters and
+local variables.   A declaration after the begin statement of a procedure
+script is a declaration of a local variable, but any other declaration
+defines a parameter.  Parameters are generally saved between invocations
+of a script while local variables are not.
+
+Parameter and variable declarations should always precede executable
+statements with a script.  Certain functions are legal before
+declarations, but this depends upon certain hidden aspects of
+declarations which are not obvious to the user.
+.ih
+EXAMPLES
+
+.nf
+real	x
+int	ii=32
+int	y {min=0, max=14}
+char	z="abc" {enum="abc|def|ghi", mode="q"}
+
+bool	isotest {YES, mode="ql",
+	    prompt="Do you want to test for isotropy?"}
+
+int	ii=1 {min=0,max=10, prompt="Number of images", mode="h"}
+file	infile="testfile" {filetype="r"}
+struct	line {length=80, mode="h"}
+
+real	array[10]
+int	iarray[15]=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 {min=0, max=100}
+int	jarray[15] { 5(0), 5(2), 5(4), min=0, max=400}
+char	carray[5]= 5("Junk")
+bool	flags[4,-3:3] = 28(NO) {mode="h", prompt="Value set"}
+file	inp_files[3]= "fil1.inp", "fil2.inp", "fil3.inp"
+
+int	karray[3]=1	# (note second and third elements are undefined)
+struct	*list="inputfile.list" {mode="q"}
+int	*ilist="infile.inp" {mode="h", min=0, max=100}
+.fi
+.ih
+BUGS
+.nf
+Options are only permitted for parameters, not local variables.
+The filetype options are recognized but are not implemented internally.
+.fi
+.ih
+SEE ALSO
+parameters, procedure
+.endhelp