Chapter-2/2-5/any.c
/* any:  returns the first location in s1 where any character from s2
         occurs, or -1 if s1 contains no characters from s2. */
returns the first location in s1 where any character from s2
occurs, or -1 if s1 contains no characters from s2.
returns the first location in s1 where any character from s2 occurs or - 1 if s1 contains no characters from s2 .
int any(char s1[], char s2[]) {
  int i, k;
  for (i = 0; s1[i] != '\0'; i++)
    for (k = 0; s2[k] != '\0'; k++)
      if (s1[i] == s2[k]) return i;
  return -1; 
}
int any ( char s1 [ ] , char s2 [ ] ) { int i , k ; for ( i = 0 ; s1 [ i ] != ' \0 ' ; i ++ ) for ( k = 0 ; s2 [ k ] != ' \0 ' ; k ++ ) if ( s1 [ i ] == s2 [ k ] ) return i ; return -1 ; }
any:  returns the first location in s1 where any character from s2
occurs, or -1 if s1 contains no characters from s2.
any : returns the first location in s1 where any character from s2 occurs or - 1 if s1 contains no characters from s2 .
/* s1 contains no characters from s2 */