struct Temp{};sizeof(Temp); // 1struct Temp{};
sizeof(Temp); // 1

struct Stu{
	int age;
	char sex;
}
sizeof(Stu); // 8 最后補三個字節滿足規則2

struct Stu2{
	char sex;
	int age;
}
sizeof(Stu2); // 8 char后面補三個字節滿足規則1

#include <stdio.h>
typedef int(*fun)(void);
int getParentSex() 
{
    return 1;
}
int getSonSex() 
{
    return 2;
}
struct Parent
{
    fun getSex;
};
struct Son
{
    fun getSex;
};
int main()
{
	// 通過函數指針的賦值達到虛函數的作用
    struct Parent parent;
    parent.getSex = getParentSex;
    struct Son son;
    son.getSex = getSonSex;
    printf("Parent sex is %d \nson sex is %d\n", parent.getSex(), son.getSex());
    getchar();
}