error: Invalid call to disp.  Correct usage is:

 -- disp (X)
 -- STR = disp (X)
error: called from
    print_usage at line 91 column 5
    ex4 at line 2 column 1

one hundred and twenty three million four hundred and fifty six thousand seven hundred and eighty nine

one hundred and twenty three million four hundred and fifty six thousand seven hundred and eighty nine