CIS 554 -- REBOL Quiz

Name __________________________________

1. (1 point) Is this a valid first line for a REBOL program?
      Rebol [ ]
Why or why not?
   
   Yes. REBOL is case insensitive; the brackets are required but may be empty.
   
   
   
2. (2 points) Briefly tell what each of the following functions does, including how each parameter is used.
   
   
   1. either
      
      Usage: either condition true-block false-block
      If condition is TRUE, evaluates the first block, else evaluates the second.
      
      
      
   2. do
      
      Usage: do value
      Evaluates a block, file, URL, function, word, or any other value.
      
      
      
3. (1 point) Put parentheses in the following to show how it is evaluated by REBOL:
   
   while and greater? x 0 lesser? x 100 x: to-integer read  %nums.txt

while (and (greater? x 0) (lesser? x 100)) (x: to-integer (read  %nums.txt))
   
   
4. (1 point) Create a button named save-button, with the text Save, that when clicked will call the save function (which has no arguments).
   
   save-button: button "Save" [save]