模拟实现strcpy函数

Posted 2020-11-17 yishengpan

模拟实现strcpy函数

a、代码简练的

 1 #include<stdio.h>
 2 #include<assert.h>
 3 
 4 //模拟实现
 5 void my_strcpy(char* dest, const char* src)
 6 {
 7     assert(dest != NULL);
 8     assert(src != NULL);
 9     while (*dest++ = *src++)
10     {
11         ;
12     }
13 }
14 
15 
16 //打印数组
17 void Print(char* arr)
18 {
19     while (*arr != ‘‘)
20     {
21         printf("%c",*arr);
22         arr++;
23     }
24 }
25 int main()
26 {
27     char arr[] = "abcdefg";
28     my_strcpy(arr,"hello");
29     Print(arr);
30     system("pause");
31     return 0;
32 }

b、代码相对容易理解

 1 #include<stdio.h>
 2 #include<assert.h>
 3 
 4 void my_strcpy(char* dest, const char* src)
 5 {
 6     assert(dest != NULL);
 7     assert(src != NULL);
 8     while (*src != ‘‘)
 9     {
10         *dest = *src;
11         dest++;
12         src++;
13     }
14     *dest = *src;
15 }
16 
17 void Print(char* arr)
18 {
19     while (*arr != ‘‘)
20     {
21         printf("%c",*arr);
22         arr++;
23     }
24 }
25 int main()
26 {
27     char arr[] = "abcdefg";
28     my_strcpy(arr,"hello");
29     Print(arr);
30     system("pause");
31     return 0;
32 }