`ctrl'
------

ctrl("SWITCH",ONOFF)
     :: Ķ

RETURN
     0 ޤ 1
SWITCH
     å̾
ONOFF
     ե饰 (Ǥ)

   * Asir μ¹ԴĶѹԤ. ե饰 0 ʤХå SWITCH 
      off ˤ, ʳʤ on ˤ.
   * åʸȤϤ. ʤ֥륯ȤǰϤ.
   * åϼ̤.
     `cputime'
          on λ CPU time  GC time ɽ, off λ ɽʤ. 
          `cputime()'򻲾. `ctrl("cputime",ONOFF)'  
          `cputime(ONOFF)' ƱǤ.
     `nez'
          EZGCD Υ르ꥺؤ. ǥեȤ 1 Ǥ, Ȥ
          ؤɬפϤʤ.
     `echo'
          on λɸϤ򷫤֤ƽϤ, off λɸϤ
          ֤ʤ.  `output' ޥɤѤݤͭǤ.
     `bigfloat'
          on λ, Ϥ줿ư bigfloat Ѵ, ư
          黻PARI (*Note pari::) ˤԤ. ǥեȤͭ
           9 Ǥ. ͭ䤷ˤ `setprec()' 
          . off λ, Ϥ줿ư, ưѴ
          .
   * ˤ 1 , ԤȤ Ѱդ줿åʳ
     Τꤷˤ 0 ֤.


     `cputime', `output', `pari', `setprec', `eval'

