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Message: [QUOTE="Frank Silvermann, post: 2468615"] That's where I'm headed with this, but I need to stay in the shallows for a little longer. I had forgotten that C was going to give me modulo without trying so hard. This looks right on the nuts to me. I could, for this function's sake, now sack the SWAP macro. You probably skimmed right past it, but given that I'm going to need it elsewhere, I might as well use it. Your roll_again_threshold versus my top is a subtle comparison. At first they appear different but your while condition allows one more or less than mine. roll_again_threshold must be right (modulo num_results) else cases will not be equiprobable. At this point, I believe we are both within two of the correct value. gruss, frank [/QUOTE]