找出以下程序中的bug： struct Record{ int a; int b; }; int create(struct Record *p, int num) { p = new struct Record[num]; if (!p) return -1; else return 0; } int Test() { struct Record *p = NULL; int i; int num; printf("0x%08x\n", p); scanf("Input record num:%d", &num); if (create(p, num) < 0) return -1; printf("0x%08x\n", p); for (i = 0; i < num; i++) { p[i].a = 0; p[i].b = 0; } return 0; } int main(void) { Test(); getchar(); return 0; }