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Test Your Knowledge in Computers #586
Difficulty: Medium
Making many function calls can be costly in terms of stack space. One optimization that can be made is to use tail recursion.
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tk_messagebox(1t) [opensolaris man page]

tk_messageBox(1T)					       Tk Built-In Commands						 tk_messageBox(1T)

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NAME
tk_messageBox - pops up a message window and waits for user response. SYNOPSIS
tk_messageBox ?option value ...? _________________________________________________________________ DESCRIPTION
This procedure creates and displays a message window with an application-specified message, an icon and a set of buttons. Each of the but- tons in the message window is identified by a unique symbolic name (see the -type options). After the message window is popped up, tk_mes- sageBox waits for the user to select one of the buttons. Then it returns the symbolic name of the selected button. The following option-value pairs are supported: -default name Name gives the symbolic name of the default button for this message window ('ok', 'cancel', and so on). See -type for a list of the symbolic names. If this option is not specified, the first button in the dialog will be made the default. -icon iconImage Specifies an icon to display. IconImage must be one of the following: error, info, question or warning. If this option is not speci- fied, then the info icon will be displayed. -message string Specifies the message to display in this message box. -parent window Makes window the logical parent of the message box. The message box is displayed on top of its parent window. -title titleString Specifies a string to display as the title of the message box. The default value is an empty string. -type predefinedType Arranges for a predefined set of buttons to be displayed. The following values are possible for predefinedType: abortretryignore Displays three buttons whose symbolic names are abort, retry and ignore. ok Displays one button whose symbolic name is ok. okcancel Displays two buttons whose symbolic names are ok and cancel. retrycancel Displays two buttons whose symbolic names are retry and cancel. yesno Displays two buttons whose symbolic names are yes and no. yesnocancel Displays three buttons whose symbolic names are yes, no and cancel. EXAMPLE
set answer [tk_messageBox -message "Really quit?" -type yesno -icon question] switch -- $answer { yes exit no {tk_messageBox -message "I know you like this application!" -type ok} } KEYWORDS
message box ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTk | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tk is available on http://opensolaris.org. Tk 4.2 tk_messageBox(1T)

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