INPUT

TYPE: BASIC I/O Statement

FORMAT: INPUT variable

Action: Displays prompt and accepts input from keyboard.

• variable is a simple variable or array element.
• Prints a question mark and space, after which the cursor is displayed.
  • The initial value of the variable is not displayed.
  • The user then types the data to be assigned to the variable, then the Enter key.
  • The Backspace key will delete the character to the left of the cursor.
    • If there are no characters to delete, a beep is generated.
  • If Enter is pressed with no characters entered, INPUT ends leaving the variable unchanged.
  • If a numeric variable is specified and the entered data is not a valid numeric literal:
    • The message ? Redo from start is displayed on a new line.
    • The question mark is printed at the beginning of the next line and entry starts over.

Examples:

FORMAT: INPUT variable_list

Action: As above with multiple entries.

• variable_list is a series of variables separated by commas.
• ToDo finish this

Examples:

FORMAT: INPUT "prompt" ; variables

Action: As above but displays the specified text before prompting for input.

• variables is either a single variable or a comma separated list of variables
• prompt is the text to be displayed before the question mark.
  • The text must be surrounded by quotation marks.
  • String expressions are not allowed.
• ToDo finish this

Examples:

FORMAT: INPUT ( row , column ) , minlen , maxlen , token variable

Action: Accepts data input at the specified screen position.

• row and column specify the position at which data entry begins.
  • The initial value of the variable, is displayed at the specified location, immediately followed by the cursor.
• minlen specifies a minimum length for the entered data.
  • If the entered data is less than minlen characters long, a beep is generated and data entry continues.
  • Trailing spaces are removed from the entry before checking the length.
• maxlen specifies the maximum length of the entered data.
  • When the entry length is equal to maxlen, any subsequent keystrokes will generate a beep and will not added to the entry.
  • A maximum of maxlen + 1 characters will be displayed on screen during entry.
• token specifies the type of entry:
  • INT specifies an integer value.
    • This option is currently under development

- `STR` specifies a string value.
  - _variable_ must be a string simple variable or array element.
    - If the initial length of string is greater than _maxlen_, _String too long error_ results.
  - **ToDo:** finish this
- Action keys: **think of a better phrase**
  - **ToDo:** finish thi