int maximum_and = 0, maximum_or = 0, maximum_xor = 0, and = 0 , or = 0 , xor = 0; for (int i = 1 ; i <= n ; i++) { for (int j = i+1 ; j<= n; j++) {

    and = i & j;
    or = i | j;
    xor = i ^ j;

    if((maximum_and < and) && (and < k))
        maximum_and = and;
    if((maximum_or < or) && (or < k))
        maximum_or = or;
    if((maximum_xor < xor) && (xor < k))
        maximum_xor = xor;
}

} printf("%d\n%d\n%d",maximum_and,maximum_or,maximum_xor);