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看linux是32位还是64位最简单的方法：getconf LONG_BIT在32位和64位机器上运行如下命令，结果如下：[b@002 ~]$ getconf LONG_BIT64[root@pmx4 /]# getconf LONG_BIT32
2011-03-21 17:29:22 分类： C/C++ 可用如sizeof（char),sizeof(char*)等得出 32位编译器 char ：1个字节 char*（即指针变量）: 4个字节（32位的寻址空间是2^32, 即32个bit，也就是4个字节。同理64位编译器） short int : 2个字节 int： 4个字节 unsigned int : 4个字节 float: 4个字节 double: 8个字节 long: 4个字节 long long: 8个字节 unsigned long: 4个字节 64位编译器 char ：1个字节 char*(即指针变量): 8个字节 short int : 2个字节 int： 4个字节 unsigned int : 4个字节 float: 4个字节 double: 8个字节 long: 8个字节 long long: 8个字节 unsigned long: 8个字节 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#include 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 1size of char max 127size of char min -128size of int 4size of int min -2147483648size of int max 2147483647size of long 8 |32位是4size of long min -9223372036854775808size of long max 9223372036854775807size of short 2size of short min -32768size of short max 32767size of unsigned char 1size of unsigned char max 255size of unsigned long 8 |32位是4size of unsigned long max 18446744073709551615size of unsigned short 2size of unsigned short max 65535size of double 8size of long long 8size of long double 16 |32位是12size of float 4size of pointer 8 |32位是4
Linux系统如何查看版本信息 输入"uname -a ",可显示电脑以及操作系统的相关信息。 输入"cat /proc/version",说明正在运行的内核版本。 输入"cat /etc/issue", 显示的是发行版本信息 lsb_release -a (适用于所有的linux，包括Redhat、SuSE、Debian等发行版，但是在debian下要安装lsb)
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