C/C++ 变量内存地址高低位安排

就拿自由变量来说：

1. 自由变量分配地址是从高地址 -> 低地址的（自由变量放在栈中，其他的变量地址都是从低到高分配）

2.多字节的变量，高位在高地址，低位在低地址。

测试： 

#include <stdio.h>int main (){  int x = 0x00f00fff;  int y = 0xfff00f00;   unsigned char *px1,*px2,*px3,*px4;  unsigned char *py1,*py2,*py3,*py4;    px1 = (char *)&x + 0;  px2 = (char *)&x + 1;  px3 = (char *)&x + 2;  px4 = (char *)&x + 3;    py1 = (char *)&y + 0;  py2 = (char *)&y + 1;  py3 = (char *)&y + 2;  py4 = (char *)&y + 3;    printf("&x = %08x \n",&x);  printf("&x = %08x %08x %08x %08x\n",px1,px2,px3,px4);  printf("x = %08x \n",x);  printf("x = %x %x %x %x\n",*px1,*px2,*px3,*px4);    printf("&y = %08x \n",&y);  printf("&y = %08x %08x %08x %08x\n",py1,py2,py3,py4);  printf("y = %08x \n",y);  printf("y = %02x %02x %02x %02x\n",*py1,*py2,*py3,*py4);    return 0;}