pos = strpos1(s1,ch);

   if (pos >= 0)

      printf("%c found at position %d\n", ch, pos);

   else

      printf ("%c is not in the string\n", ch);

int strpos1 (char *s, char c)

{/* return the position of c in s

  This version is case sensitive

  Exercise 4 */

   int i;

   for (i = 0; i < strlen(s); i++)

      if (c == s[i]) return i;

	  return -1;

}