For rest of the two digit numbers i . e . , 21 to 99
else { int i = ( num [ x ] - '0' ) ; if ( i > 0 ) { ans += tens_multiple [ i ] ; ans += " ▁ " ; } else ans += " " ; ++ x ; if ( num [ x ] - '0' != 0 ) ans += single_digits [ num [ x ] - '0' ] ; } } ++ x ; } return " " ; }