C示例程序搜索字符串

#include <stdio.h>

#include <string.h>



int main() {

   char s1[] = "Beauty is in the eye of the beholder";

   char s2[] = "the";



   int n = 0;

   int m = 0;

   int times = 0;

   int len = strlen(s2);      // contains the length of search string



   while(s1[n] != '\0') {



      if(s1[n] == s2[m]) {     // if first character of search string matches



         // keep on searching



         while(s1[n] == s2[m]  && s1[n] !='\0') {

            n++;

            m++;

         }



         // if we sequence of characters matching with the length of searched string

         if(m == len && (s1[n] == ' ' || s1[n] == '\0')) {



            // BINGO!! we find our search string.

            times++;

         }

      } else {            // if first character of search string DOES NOT match

         while(s1[n] != ' ') {        // Skip to next word

            n++;

            if(s1[n] == '\0')

            break;

         }

      }



      n++;

      m=0;  // reset the counter to start from first character of the search string.

   }



   if(times > 0) {

      printf("'%s' appears %d time(s)\n", s2, times);

   } else {

      printf("'%s' does not appear in the sentence.\n", s2);

   }



   return 0;

}