On Saturday, 21 December 2013 at 22:29:59 UTC, ponce wrote:
On Saturday, 21 December 2013 at 22:22:09 UTC, Charles Hixson wrote:
I was planning to ask if there were a better way to do this, but instead I need to ask what's my mistake? For some reason, if called with an uninitialized ubyte array, and an index of 0, it returns a value of 8, even though all the values in the array are 0. The error has to be somewhere in the "ret = " statement, but I sure don't see it.

/** Convert 8 consecutive bytes sliced from a ubyte[] into a ulong
* @param    block    The array from which to slice.
* @param    n    The starting index within the block    */
ulong    ubytesToUlong(ubyte[] block, int n)
{    ulong    ret;
   assert (n >= 0);
   assert (n + 8 <= block.length);
   writefln ("n = %s", n);
   writefln ("block[0] = %s", cast(ulong)block[0]);
   writefln ("block[1] = %s", cast(ulong)block[1]);
   writefln ("block[2] = %s", cast(ulong)block[2]);
   writefln ("block[3] = %s", cast(ulong)block[3]);
   writefln ("block[4] = %s", cast(ulong)block[4]);
   writefln ("block[5] = %s", cast(ulong)block[5]);
   writefln ("block[6] = %s", cast(ulong)block[6]);
   writefln ("block[7] = %s", cast(ulong)block[7]);
   ret    =    cast(ulong)block[n] * 2^21
           +    cast(ulong)block[n+1] * 2^18
           +    cast(ulong)block[n+2] * 2^15
           +    cast(ulong)block[n+3] * 2^12
           +    cast(ulong)block[n+4] * 2^9
           +    cast(ulong)block[n+5] * 2^6
           +    cast(ulong)block[n+6] * 2^3
           +    cast(ulong)block[n+7] * 2^0;
   writefln ("ret = %s", ret);
   return    ret;
}

Use the exponentiation operator which is spelled: ^^

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