類型

位(byte)

范圍

char

1

-128—127 or 0 – 255

unsigned char

1

0 – 255

signed int

1

-128—127

int

4

-2^31 – 2^32-1

unsigned int

4

0 – 2^32

signed int

4

-2^31 – 2^32-1

short int

2

2^15 – 2^15-1

unsigned short int

2

0 – 2^16

signed short int

2

2^15 – 2^15-1

long int

8

-2^63 – 2^63-1

signed long int

8

-2^63 – 2^63-1

unsigned long int

8

0 – 2^64

float

4

+/- 3.4e +/-38(~7個數字)

double

8

+/-1.7e +/- 308（~15個數字）

long double

16

+/-1.7e +/- 208（~15個數字）