Size of的用法

#include <cstdlib>
#include <iostream>
#include <iterator>
#include "string.h"
using namespace std;
struct{
    short a1;
    short a2;
    short a3;
}A;

struct{
    long a1;
    short a2;
}B;

int main() {

    std::cout << "Hello World!\n";
    char *ss1 = "0123456789";
    char ss2[] = "0123456789";
    char ss3[100] = "0123456789";
    int ss4[100];
    
    char q1[] = "abc";
    char q2[] = "a\n";
    char *q3 = "a\n";

    char *str1 = (char *)malloc(100);
    char *str2 = (char *)malloc(100);

    cout << "sizeof(ss1) = " << sizeof(ss1) << endl; // 64位操作系统就是显示的8，32位操作系统显示的4. *
    cout << "strlen(ss1) = " << strlen(ss1) << endl; //10
    cout << "sizeof(ss2) = " << sizeof(ss2) << endl; //11*
    cout << "sizeof(ss3) = " << sizeof(ss3) << endl; //100
    cout << "sizeof(ss4) = " << sizeof(ss4) << endl; //400*

    cout << "sizeof(q1) = " << sizeof(q1) << endl; //4
    cout << "sizeof(q2) = " << sizeof(q2) << endl; //3
    cout << "sizeof(q3) = " << sizeof(q3) << endl; //8*

    cout << "sizeof(A) = " << sizeof(A) << endl;  //6
    cout << "sizeof(B) = " << sizeof(B) << endl;  //16 *

    cout << "sizeof(str1) = " << sizeof(str1) << endl; //8 *
    cout << "sizeof(str2) = " << sizeof(str2) << endl; //8 *
    


    return 0;    

}