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Input

interactively reads in one Wolfram Language expression.

Input[prompt]

requests input, displaying prompt as a "prompt".

Input[prompt,init]

in a notebook front end uses init as the initial contents of the input field.

Details and Options

Input returns the expression it reads.
The operation of Input may vary from one computer system to another. When a Wolfram System front end is used, Input typically works through a dialog box.
When no front end is used, Input reads from standard input.
If the standard input is a file, then Input returns EndOfFile if you try to read past the end of the file.
On systems with textual input, Input[] uses ? as a prompt.
When Input is evaluated, the Wolfram System stops until the input has been read.
With a notebook front end, Input by default puts up a dialog window with a standard appearance.
The prompt given can be text, graphics or any expression.
Input takes notebook options. The default settings include WindowFloating->False, WindowSize->All and WindowTitle->None.
Input by default puts up a dialog in the middle of the main display screen. Explicit settings for WindowMargins override this.
The options for InputField can be given directly as options to Input to control the properties of its input field.
Input[prompt] is equivalent to Input[prompt,""].

Examples

Basic Examples (2)

Get an input expression and square it:

Request input of a function to plot:

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