Size of的用法

 1 #include <cstdlib>
 2 #include <iostream>
 3 #include <iterator>
 4 #include "string.h"
 5 using namespace std;
 6 struct{
 7     short a1;
 8     short a2;
 9     short a3;
10 }A;
11 
12 struct{
13     long a1;
14     short a2;
15 }B;
16 
17 int main() {
18 
19     std::cout << "Hello World!\n";
20     char *ss1 = "0123456789";
21     char ss2[] = "0123456789";
22     char ss3[100] = "0123456789";
23     int ss4[100];
24     
25     char q1[] = "abc";
26     char q2[] = "a\n";
27     char *q3 = "a\n";
28 
29     char *str1 = (char *)malloc(100);
30     char *str2 = (char *)malloc(100);
31 
32     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. *
33     cout << "strlen(ss1) = " << strlen(ss1) << endl; //10
34     cout << "sizeof(ss2) = " << sizeof(ss2) << endl; //11*
35     cout << "sizeof(ss3) = " << sizeof(ss3) << endl; //100
36     cout << "sizeof(ss4) = " << sizeof(ss4) << endl; //400*
37 
38     cout << "sizeof(q1) = " << sizeof(q1) << endl; //4
39     cout << "sizeof(q2) = " << sizeof(q2) << endl; //3
40     cout << "sizeof(q3) = " << sizeof(q3) << endl; //8*
41 
42     cout << "sizeof(A) = " << sizeof(A) << endl;  //6
43     cout << "sizeof(B) = " << sizeof(B) << endl;  //16 *
44 
45     cout << "sizeof(str1) = " << sizeof(str1) << endl; //8 *
46     cout << "sizeof(str2) = " << sizeof(str2) << endl; //8 *
47     
48 
49 
50     return 0;    
51 
52 }