Data Type Ranges in C

Type Name Bytes Other Names Range of Values
int 4 signed -2,147,483,648 to 2,147,483,647
unsigned int 4 unsigned 0 to 4,294,967,295
__int8 1 char -128 to 127
unsigned __int8 1 unsigned char 0 to 255
__int16 2 short, short int, signed short int -32,768 to 32,767
unsigned __int16 2 unsigned short, unsigned short int 0 to 65,535
__int32 4 signed, signed int, int -2,147,483,648 to 2,147,483,647
unsigned __int32 4 unsigned, unsigned int 0 to 4,294,967,295
__int64 8 long long, signed long long -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
unsigned __int64 8 unsigned long long 0 to 18,446,744,073,709,551,615
bool 1 none false or true
char 1 none -128 to 127 by default

0 to 255 when compiled by using /J

signed char 1 none -128 to 127
unsigned char 1 none 0 to 255
short 2 short int, signed short int -32,768 to 32,767
unsigned short 2 unsigned short int 0 to 65,535
long 4 long int, signed long int -2,147,483,648 to 2,147,483,647
unsigned long 4 unsigned long int 0 to 4,294,967,295
long long 8 none (but equivalent to __int64) -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
unsigned long long 8 none (but equivalent to unsigned __int64) 0 to 18,446,744,073,709,551,615
enum varies none
float 4 none 3.4E +/- 38 (7 digits)
double 8 none 1.7E +/- 308 (15 digits)
long double same as double none Same as double
wchar_t 2 __wchar_t 0 to 65,535

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