字符串自实现的拼接

 1 //子实现字符串的拼接
 2 //2017.3.7
 3 
 4 #include <stdio.h>
 5 #include <stdlib.h>
 6 void strcat(char *p1, char *p2,int n1,int n2);
 7 int main()
 8 {
 9     char str1[100] = "dfdfdfdf";
10     char str2[200] = "abcdfe";
11     char *p1 = str1;
12     char *p2 = str2;
13     int n1 = 0;
14     int n2 = 0;
15 
16     strcat(p1, p2,n1,n2);
17     printf("拼接完成后的字符串为%s
", str1);
18     system("pause");
19     return 1;
20 }
21 
22 void strcat(char *p1, char *p2, int n1, int n2)
23 {
24     int i = 0;
25     while (*p1 != '')
26     {
27         n1++;
28         p1++;
29     }
30     //此时已经走到字符串str1的末尾
31     //遍历字符串str2
32     while (*p2 != '')
33     {
34         *(p1) = *(p2 );
35         p1++;
36         p2++;
37     }
38     *p1 = '';//记住这一句哈
39 }