查找指定字符串在某个字符串中的出现次数

c语言代码实现：

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1. #include<stdio.h>
   
2. #include<string.h>
   
3. int searchnum(char *str,char *pattern)
   
4. {
   
5.         if (str == NULL)
   
6.             return 0;
   
7.         char *pos = NULL;
   
8.         int count = 0;
   
9.         while ((pos = strstr(str,pattern)) != NULL)
   
10.         {
    
11.             count++;
    
12.             pos += (strlen(pattern));
    
13.             str = pos;
    
14.     //        count = count+1;
    
15.         }
    
16.         return count;
    
17. }
    
18. int main()
    
19. {
    
20.     char *str = "world hello world word world";
    
21.     printf("%d\n",searchnum(str,"world"));
    
22.     return 0;
    
23. }

运行结果：
[root@localhost ~]# ./a.out
3