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#include <stdio.h>int write_file(char *text, char *file);int main(){   FILE *fin;   int i, ch, end = 0, length = 0;   char *end_str = "END", filename[25], *p;   fin = fopen("temp.log", "w+");   while ((ch = getchar()) != EOF) {      if (ch != 'E' && ch != 'N' && ch != 'D') {         for (i = 0; i < end; i++) fputc(end_str[i], fin);         end = 0;         length++;         fputc(ch, fin);                  if (ch == '.' || ch == '!' || ch == '?') {            fputc('\n', fin);            length++;         }      } else {         if (!end && (ch == 'N' || ch == 'D')) {            fputc(ch, fin);            length++;         } else {            if (end_str[end] == ch) {               end++;               if (end == 3) break;            }         }      }   }   i = 0;   p = (char *) calloc(length, sizeof(char));   rewind(fin);   while ((ch = fgetc(fin)) != EOF) p[i++] = ch;   p[length] = 0x00;   fclose(fin);   printf("Filename: ");   scanf("%s", filename);   if (write_file(p, filename)) {      printf("Sucessfull!\n");   } else {      printf("Error\n");   }   getche();   free(p);   return 0;}int write_file(char *text, char *file){   FILE *fin;   if ((fin = fopen(file, "w")) == NULL)      return 1;   if (fwrite(text, sizeof(char), strlen(text), fin) < strlen(text)) {      fclose(fin);      return 1;   }   fclose(fin);   return 0;}