深拷贝_浅拷贝

Posted 2020-07-23 邓戈麟

 

 

深拷贝，拷贝内存的内容，旧结构体发生变化，新结构体也会变化。

浅拷贝，直接地址复制，共享内存，新旧结构体互补影响。

 

 1 #define _CRT_SECURE_NO_WARNINGS
 2 
 3 #include <stdio.h>
 4 #include <stdlib.h>
 5 #include <string.h>
 6 
 7 struct string
 8 {
 9     char *p;
10     int length;
11 };
12 
13 main1()
14 {
15     struct string str1;
16     str1.length = 10;
17     str1.p = (char *)malloc(sizeof(char) * 10);
18     strcpy(str1.p, "hello");
19 
20     printf("str1.p=%s\n", str1.p);
21 
22     struct string str2;//浅拷贝，共享内存
23     str2.length = str1.length;
24     str2.p = str1.p;
25     *(str1.p) = ‘k‘;
26 
27     printf("str1.p=%s\n", str1.p);
28     printf("str2.p=%s\n", str2.p);
29 
30     system("pause");
31 }
32 
33 main()
34 {
35     struct string str1;
36     str1.length = 10;
37     str1.p = (char *)malloc(sizeof(char) * 10);
38     strcpy(str1.p, "hello");
39 
40     printf("str1.p=%s\n", str1.p);
41 
42     struct string str2;//深拷贝
43     str2.length = str1.length;
44     str2.p = (char *)malloc(sizeof(char) * 10);
45     strcpy(str2.p, str1.p);
46 
47     printf("str1.p=%s\n", str1.p);
48     printf("str2.p=%s\n", str2.p);
49 
50     system("pause");
51 }