Check whether the number has only first and last bits set | Set 2 | function to check whether the number has only first and last bits set ; Driver Code
function onlyFirstAndLastAreSet ( n ) { if ( n == 1 ) return true ; if ( n == 2 ) return false ; return ( ( ( n - 1 ) & ( n - 2 ) ) == 0 ) ; } var n = 9 ; if ( onlyFirstAndLastAreSet ( n ) ) document . write ( " " ) ; else document . write ( " " ) ;