구조체 초기화 질문있습니다.

#include <iostream>
#include <windows.h>
#include <memory.h>
 
 
typedef struct
{
	int a;
	int b;
} ST_ABC;
 
 
void fn(ST_ABC * p)
{
	printf("%x\n", p);
}
 
 
#if 0
wingdi.h
  typedef struct _ABC {
    int abcA;
    UINT abcB;
    int abcC;
  } ABC,*PABC,*NPABC,*LPABC;
#endif
 
 
int main(int argc, char** argv) 
{
 
	ST_ABC ABCStruct1 = { 2, };
	printf("a %d\n", ABCStruct1.a);
	printf("b %d\n", ABCStruct1.b);
	printf("%x\n", ABCStruct1);
	printf("%x\n", &ABCStruct1);
	printf("\n");
 
 
	ST_ABC ABCStruct2;
	ABCStruct2.a = 10;
	ABCStruct2.b = 20;
	ZeroMemory(&ABCStruct2, sizeof(ST_ABC));
	printf("a %d\n", ABCStruct2.a);
	printf("b %d\n", ABCStruct2.b);
	printf("%x\n", ABCStruct2);
	printf("%x\n", &ABCStruct2);
	printf("\n");
 
 
	ST_ABC ABCStruct3;
	ABCStruct3.a = 10;
	ABCStruct3.b = 20;
	memset(&ABCStruct3, 0x00, sizeof(ST_ABC));
	printf("a %d\n", ABCStruct3.a);
	printf("b %d\n", ABCStruct3.b);
	printf("%x\n", ABCStruct3);
	printf("%x\n", &ABCStruct3);
	printf("\n");
 
 
	fn((ST_ABC*)&ABCStruct3);
 
 
	ST_ABC * p;
	p = &ABCStruct3;	
	printf("%x\n", p);
 
	return 0;
}
 
 
#if 0
 
a 2
b 0
2
22fee4
 
a 0
b 0
0
22fedc
 
a 0
b 0
0
22fed4
 
22fed4
22fed4
 
--------------------------------
Process exited after 0.02142 seconds with return value 0
계속하려면 아무 키나 누르십시오 . . .
 
#endif