Linux系统32位与64位数据类型长度比较

Linux系统32位与64位GCC编译器基本数据类型长度对照表

GCC 32位

sizeof(char)=1

sizeof(double)=8

sizeof(float)=4

sizeof(int)=4

sizeof(short)=2

sizeof(long)=4

sizeof(long long)=8

sizeof(long double)=12

sizeof(complex long double)=24

GCC 64位

sizeof(char)=1

sizeof(double)=8

sizeof(float)=4

sizeof(int)=4

sizeof(short)=2

sizeof(long)=8

sizeof(long long)=8

sizeof(long double)=16

sizeof(complex long double)=32 

转自：http://www.2cto.com/os/201107/96237.html

32位，指针占用4个字节；64位，指针占用8个字节。 以下是实测结果：

#include <stdio.h>

#include <limits.h>

int main(void)

{

printf("size of char %d\n",sizeof(char));

printf("size of char max %d\n",CHAR_MAX);

printf("size of char min %d\n",CHAR_MIN);

printf("size of int %d\n",sizeof(int));

printf("size of int min %d\n",INT_MIN);

printf("size of int max %d\n",INT_MAX);

printf("size of long %d\n",sizeof(long));

printf("size of long min %ld\n",LONG_MIN);

printf("size of long max %ld\n",LONG_MAX);

printf("size of short %d\n",sizeof(short));

printf("size of short min %d\n",SHRT_MIN);

printf("size of short max %d\n",SHRT_MAX);

printf("size of unsigned char %d\n",sizeof(unsigned char));

printf("size of unsigned char max %d\n",UCHAR_MAX);

printf("size of unsigned long %d\n",sizeof(unsigned long));

printf("size of unsigned long max %lu\n",ULONG_MAX);

printf("size of unsigned short %d\n",sizeof(unsigned short));

printf("size of unsigned short max %u\n",USHRT_MAX);

printf("size of double %d\n",sizeof(double));

printf("size of long long %d\n",sizeof(long long));

printf("size of long double %d\n",sizeof(long double));

printf("size of float %d\n",sizeof(float));

int *p;

printf("size of pointer  %d\n",sizeof(p));

}

64 |32位上运行结果：

 size of char 1

size of char max 127

size of char min -128

size of int 4

size of int min -2147483648

size of int max 2147483647

size of long 8  |32位是4

size of long min -9223372036854775808

size of long max 9223372036854775807

size of short 2

size of short min -32768

size of short max 32767

size of unsigned char 1

size of unsigned char max 255

size of unsigned long 8 |32位是4

size of unsigned long max 18446744073709551615

size of unsigned short 2

size of unsigned short max 65535

size of double 8

size of long long 8

size of long double 16  |32位是12

size of float 4

size of pointer 8  |32位是4