Check whether all the bits are set in the given range | function to check whether all the bits are set in the given range or not ; calculating a number ' num ' having ' r ' number of bits and bits in the range l to r are the only set bits ; new number which will only have one or more set bits in the range l to r and nowhere else ; if both are equal , then all bits are set in the given range ; else all bits are not set ; Driver code
function allBitsSetInTheGivenRange ( n , l , r ) { var num = ( ( 1 << r ) - 1 ) ^ ( ( 1 << ( l - 1 ) ) - 1 ) ; var new_num = n & num ; if ( num == new_num ) return " " ; return " " ; } var n = 22 ; var l = 2 , r = 3 ; document . write ( allBitsSetInTheGivenRange ( n , l , r ) ) ;