Linux系统32位与64位数据类型长度比较

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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

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