C Numeric Data Types : Data Type « Data Type « C Tutorial

1. C Tutorial
2. Data Type
3. Data Type

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:

1. char
2. int
3. float
4. double