计算结构体成员地址偏移量...

#include <cstdlib>
#include <iostream>
using namespace std;
typedef struct _NODE
{
int a;
int b[20];
char c;
}NODE;
#define FIND(struc, a) (size_t)(&(((struc*)0)->a))
int main(int argc, char *argv[])
{
cout << FIND(NODE, c) << endl;

system("PAUSE");
return EXIT_SUCCESS;
}