Arg   built-in function

The Arg function returns an argument string, or information about argument strings that were passed to the current procedure.

Syntax:   result = Arg( [ n [, option ] ] )

n -- index of Nth argument string

When n is unspecified, the Arg function returns the number of argument strings that were passed to the current procedure.

When only n is specified the Nth argument string is returned. If there are fewer arguments, an empty string is returned.

n must be a positive whole number

option -- argument existence test

option is one of: Exists, or Omitted.

If option is Exists, the Arg function returns 1 if the Nth argument was passed to the current procedure, and 0 otherwise.

If option is Omitted, the Arg function returns 1 if the Nth argument was omitted, and 1 otherwise.

Examples: say Arg() -- tells how many arguments are present say Arg( 2 ) -- shows the 2nd argument string say Arg( 5, 'E' ) -- tells whether or not the 5th argument string was passed say Arg( 4, 'O' ) -- tells whether or not the 4th argument string was omitted