Keyword Variable Type Range
char Character (or string) -128 to 127
int Integer -32,768 to 32,767
short Short integer -32,768 to 32,767
short int Short integer -32,768 to 32,767
long Long integer -2,147,483,648 to 2,147,483,647
unsigned char Unsigned character 0 to 255
unsigned int Unsigned integer 0 to 65,535
unsigned short Unsigned short integer 0 to 65,535
unsigned long Unsigned long integer 0 to 4,294,967,295
float Single-precision +/-3.4E10^38 to +/-3.4E10^38
floating-point
(accurate to 7 digits)
double Double-precision +/-1.7E10^308 to +/-1.7E10^308
floating-point
(accurate to 15 digits)
C has really only four types of variables:
char
int
float
double