1 char * strcat(char * dest, const char * src) {
2 assert(dest != NULL && src != NULL);
3 char * p = dest;
4 while (*p)
5 p++;
6 while (*p++ = *src++);
7 return dest;
8 }
9
10 int strlen(const char * src) {
11 int count = 0;
12 while (*src++)
13 count++;
14 return count;
15 }
16
17 char * strcpy(char * dest, const char * src) {
18 assert(dest != NULL && src != NULL);
19 char * p = dest;
20 while (*p++ = *src++);
21 return dest;
22 }
其中要注意:
1 while(*p++); // P最后指向‘\0’的下一位置
2 while (*p) p++; // p最后指向‘\0‘
时间: 2024-08-19 14:27:00