バイトの配置の2つの方法

#include 
#include 
#include 
#include 
#include 
#include 
#include 

#pragma pack (1)
struct data
{
	int i;
	int j;
	int k;
	char c;
};
#pragma pack ()

#pragma pack (4)
struct data2
{
	int i;
	int j;
	int k;
	char c;
};
#pragma pack ()

struct data3
{
	int i;
	int j;
	int k;
	char c;
} __attribute__((aligned(4)));

struct data4
{
	int i;
	int j;
	int k;
	char c;
}__attribute__((packed));

int main()
{
	struct data dat;
	struct data2 dat2;
	struct data3 dat3;
	struct data4 dat4;
	int datt = sizeof(dat);
	
	printf("sizeof(dat) = %d
", sizeof(dat));
	printf("sizeof(dat2) = %d
", sizeof(dat2));
	printf("sizeof(dat3) = %d
", sizeof(dat3));
	printf("sizeof(dat4) = %d
", sizeof(dat4));
	return 0;
}