20 ) CODE FOR C

1.for rings a bell -->    '\a'

Escape Sequence     Meaning

    \a          Alarm (the terminal's bell)
    \b          Backspace
    \f           Form feed (for the printer)
    \n          Newline (carriage return and line feed)
    \r          Carriage return
    \t          Tab
    \v          Vertical tab
    \\          Backslash (\)
    \?         Question mark
    \'          Single quotation mark
    \"          Double quotation mark
    \ooo     Octal number
    \xhh      Hexadecimal number
    \0         Null zero (or binary zero)