c 查找A字符串在B字符串中是否存在，计算出现的次数

主要是应用了头文件<string.h>中的strstr函数
char *
     strstr(const char *s1, const char *s2);

查找是否存在:

 #include<stdio.h>
 #include<string.h>
 int main(void)
 {
     char str3[] = {"abcabcdababc"};
     char str4[] = "abc",*b;
     int count=;
     int len = strlen(str4);
     b = strstr(str3,str4);
     if(b)
         printf("find!\n");
     else
         printf("not find\n");
     return ;
 }

计算出现的个数:

 #include<stdio.h>
 #include<string.h>
 int main(void)
 {
     char str3[] = {"abcabcdababc"};
     char str4[] = "abc",*b;
     int count=;
     int len = strlen(str4);
     b = strstr(str3,str4);
     while(b)
     {
         count++;
         b = strstr(b+len,str4);
     }
     printf("%d\n",count);

     return ;
 }