using C:

Write code for a function with the following prototype:

/* * Mask with least signficant n bits set to 1 * Examples: n = 6 --> 0x3F, n = 17 --> 0x1FFFF * Assume 1 <= n <= w */ int lower_one_mask(int n); 

Your function should follow the bit-level integer coding rules. Be careful of the case n =w.