Copy_Set_Bits_In_Range.txt

A = 10101010101

mask= 0001111100
B=    10010011001


A & mask = 00001010100

mask | B=  10011010101


create a l and r range mask for A 

int mask=1<<(l-r+1)
mask-=1;
mask=mask<<(l-1)
mask=mask&a
int ans= mask | b


Divide 

 static int divide(int dividend, int divisor)
    {
         
        // Calculate sign of divisor i.e.,
        // sign will be negative only iff
        // either one of them is negative
        // otherwise it will be positive
        int sign = ((dividend < 0) ^
                (divisor < 0)) ? -1 : 1;
     
        // Update both divisor and
        // dividend positive
        dividend = Math.Abs(dividend);
        divisor = Math.Abs(divisor);
     
        // Initialize the quotient
        int quotient = 0;
         
        while (dividend >= divisor)
        {
            dividend -= divisor;
            ++quotient;
        }
     
        return sign * quotient;
    }