`uc'
----

uc()
     :: 긵.

RETURN
     `vtype'  1 긵

   * `uc()' ¹Ԥ뤿Ӥ, `_0', `_1', `_2',... Ȥ긵
     .
   * `uc()' 줿긵, ľܥܡɤϤ뤳ȤǤ
     ʤ. , ץ̤그ư, Ϥʤ
     ˴ޤޤ긵ƱΤΤ뤳ȤɤǤ.
   * ̾긵 (`vtype'  0) μưˤ `rtostr()', `strtov()' 
     Ѥ.
   * `uc()' 줿긵긵ȤƤη (`vtype')  1 Ǥ. 
     (*Note 긵η::)

     [0] A=uc();
     _0
     [1] B=uc();
     _1
     [2] (uc()+uc())^2;
     _2^2+2*_3*_2+_3^2
     [3] (A+B)^2;
     _0^2+2*_1*_0+_1^2


     `vtype', `rtostr', `strtov'

