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Message: [QUOTE="Thomas Scrace, post: 4204049"] Hi Keith. I posted the relevant function in a previous post, but I will reproduce it here: The function is the same for the unsigned longs, except with the types of the two counter variables changed to unsigned. Scott Fluhrer pointed out that the explanation for the supernaturally fast enumeration of the 64bit longs was in the temp = -1 assignment. Because temp is an unsigned variable in the unsigned functions this actually ended up taking the value of ULONG_MAX, and the loop immediately terminated. The reason I did not realise the error was that I was looking for it to return ULONG_MAX; I just thought it was doing it in a different fashion. So, mystery solved! It's amazing how these apparently simple K&R exercises can lead to learning a lot more about the language than you initially expect. Thanks, Tom [/QUOTE]