reverse(int n)
{
    int i, result = 0;

    for(i = 0; i < 32; i++)
           result |= ((n >> i) & 1) << (31 - i);
}


.... assuming 32 bit integer to be reversed and assuming all 32 bits
to be reversed.. i.e 100101 reverses to
10100100000000000000000000000000

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