2 
 2  22         60 
 2  2          70 
 2  2          80 
 2  2          90 
 2 -1 
 2  1 
 2 -1.5 
 2  1.5 
 2 -150 
 2  150 
 2 ABC
 2  0 
 2  256 
 2  32768 
 2  65536 
 2  1.701412E+38 
 2  1.701411834604692D+38