C Data types

                 Type  Bytes  Bits                Range

            short int    2      16          -32,768 -> +32,767          (16kb)
   unsigned short int    2      16                0 -> +65,535          (32Kb)
         unsigned int    4      16                0 -> +4,294,967,295   ( 4Gb)
                  int    4      32   -2,147,483,648 -> +2,147,483,647   ( 2Gb)
             long int    4      32   -2,147,483,648 -> +2,147,483,647   ( 2Gb)
          signed char    1       8             -128 -> +127
        unsigned char    1       8                0 -> +255
                float    4      32
               double    8      64
          long double   12      96



from:
http://www.lix.polytechnique.fr/~liberti/public/computing/prog/c/C/CONCEPT/data_types.html