12.2.2  Input: input Input InputStr textinput output Output

The input command prompts the user for the value of a variable.
Input is a synonym for input.

• input takes an unspecified number of commands:
  vars, a sequence of variable names, each one optionally preceded by a string.
• input(vars) brings up a box where the user can enter a value for each variable.
  If a variable is preceded with a string, then that string will be the prompt for the variable, otherwise the variable name will be the prompt.

Examples.

• Input:
  input(a)
  Output:
  
• Input:
  input("Set a to the value: ",a)
  Output:
  
• Input:
  input(a,bee,c)
  Output:
  
• Input:
  input("Set a to the value: ",a,bee,"Set c to this value: ",c)
  Output:
  

If the value that you enter for input is a string, it should be between quotes. If you want the user to enter a string without having to use the quotes, you can use the InputStr command, which is just like input except that it will assume any input is a string and so the user won’t need to use quotes.
textinput is a synonym for InputStr.

The output command creates message windows:
Output is a synonym for output.

• output takes one argument:
  strs, a sequence of strings or variables which represent strings.
• output(strs) creates a message window displaying the concatentation of the strings.

Example.
Input:

Output:

You can use output to add information to the input window.

Example.
Input:

Output: