C++各种数据类型所占内存大小详解

#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
#include <string>
using namespace std;
typedef struct _node{
	char c1;
	char c2;
	char c3;
long long i1;
}node;
int main(){
	int i = 1;
	short t = 12;
	char c ='c';
	long long ll = 521;
	node q;
	node *pn = &q;
	int *pi = &i;
	short *pt = &t;
	char *pc = &c;
	printf("%d\n",sizeof(pn));
	printf("%d\n",sizeof(pi));
	printf("%d\n",sizeof(pt));
	printf("%d\n",sizeof(pc));
} 
// 8 8 8 8

#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
#include <string>
using namespace std;
typedef struct _node{
	char c1;
	char c2;
	char c3;
long long i1;
}node;
int main(){
	int i = 1;
	short t = 12;
	char c ='c';
	long long ll = 521;
	node q;
	node &rn = q;
	int &ri = i;
	short &rt = t;
	char &rc = c;
	printf("%d\n",sizeof(rn));
	printf("%d\n",sizeof(ri));
	printf("%d\n",sizeof(rt));
	printf("%d\n",sizeof(rc));
} 
// 16 4 1 2

struct p{
	char c1;
	short s1;
}A1;

struct p{
	char c1;
	char c2;
	short s1;
}A2;

struct p{
	char c1;
	short s1;
	char c2;
}A3;

struct p{
	char c1
	short s1;
	int  i1; 
}A4;

struct p{
	char c1;
	short s1;
	char c2;
	int i1;
}A5;

typedef struct _p{
	char c1;	
	char c2;
	char c3;	
}p;

typedef struct _p{
	char c1;	
	char c2;
	char c3;
	int i1;	
}p;

typedef struct _p{
	char c1;	
	char c2;
	char c3;
	long long ll1;	
}p;

union p{
	char c1;
	short s1;
	char c2;
	int i1;
}u;

enum _color{
	red = 1,
	yellow = 2,
	blue = 3
}Color;

class p{
};
int main(){
	printf("%d\n", sizeof(p));
} 

class p{
	public:
		void pint(void){
			printf("member function\n");
		}
};

class p{
	public:
		void pint(void){
			printf("member function\n");
		}
		void pint1(void){
			printf("member function1\n");
		}
		void pint2(void){
			printf("member function2\n");
		}
		void pint3(void){
			printf("member function3\n");
		}
};

class p{
	public:
		char c1;
};

class p{
	public:
		char c1;	
		long long ll1;
		int t2;
};