Learn-c-by-examples-program-to-search-string-in-c

Cで文字列を検索するプログラム

実装

今、私たちはプログラムの実際の実装が表示されます-

#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;
}

出力

このプログラムの出力は次のようになります-

'the' appears 2 time(s)