## Menu Interaction Function

## Usage

    menu(x, graphics = FALSE, title = "")

## Arguments

`x` | a character vector of choices
`graphics` | a logical indicating whether a graphics menu should be used. Currently unused.
`title` | a character string to be used as the title of the menu

## Description

`menu` presents the user with a menu of choices labelled from 1 to the number of choices. To exit without choosing an item one can select `0'.

## Value

The number corresponding to the selected item, or 0 if no choice was made.

## Examples

    switch(menu(c("List letters", "List LETTERS")) + 1,
           cat("Nothing done\n"), letters, LETTERS)

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