sizeof 4字节对齐

#include <iostream>

#include<assert.h>
using namespace std;

typedef struct sys{
char a;
int * b;
char c;
}sysa;

class c{
public:
    unsigned a;
    virtual void bi(c* s);
    char dd;
    static int sd;

};
int main()
{
char str2[100];

cout<<sizeof(str2)<<endl;

char str[]="jdfl中国";
char *p=str;
cout<<sizeof(p)<<endl;
cout<<sizeof(str)<<endl;
cout<<sizeof(sysa)<<endl;
cout<<sizeof(c)<<endl;
cout<<sizeof(unsigned)<<endl;
}

　　64位机

100 4 9 12 12 4