44.字符串删除指定字符或者字符串

1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4
5 //字符串中删除某一个字符
6 void deletech(char *str,char ch)
7 {
8     if (str == NULL)
9     {
10         return;
11     }
12
13     char *pstr = str;
14     while (*str != '\0')
15     {
16         if (*str != ch)
17         {
18             *pstr++ = *str++;
19         }
20         else
21         {
22             str++;
23         }
24     }
25     *pstr = 0;
26 }
27
28 //字符串中删除某一个字符串
29 void deletestr(char *str, char *des)
30 {
31     char *find = strstr(str, des);
32     while (find != NULL)
33     {
34         int len = strlen(des);
35
36         //从find开始到结尾的长度
37         for (int i = 0; i <= strlen(find) - len; i++)
38         {
39             //替换,加长度则下标到该字符串的后一位
40             *(find + i) = *(find + len + i);
41         }
42
43         //
44         find = strstr(find + 1, des);
45     }
46 }
47
48 void main()
49 {
50     char str[100] = "i love you i love her i love china i love my family";
51
52     printf("%s\n", str);
53     //deletech(str,'i');
54     deletestr(str, "love");
55     printf("%s\n", str);
56     system("pause");
57 }