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