From: daniel.kruegler@googlemail.com   
      
   Am 05.09.2012 13:21, schrieb alessandro.suglia@googlemail.com:   
   > I'm reading in these days that chapter of the book, and I've found   
   > this example quite astonishgly and also quite difficult to   
   > understand simply because trying to execute your program I'll always   
   > receive a "random value" that is absolutely constant.   
   >   
   > I don't know why exactly, maybe it's a problem of my computer, but   
   > I've noticed that removing the division operator and substituting   
   > that one with the remainder operator, the result starting to be   
   > correct.   
   >   
   > So my question is, there are some errors in my book or it's simply a   
   > distraction error??   
      
   You haven't shown us the complete code, so my suspicion is that you   
   haven't called the function srand with a different value before   
   invoking the rand() function. The C standard says:   
      
   "If rand is called before any calls to srand have been made, the same   
   sequence shall be generated as when srand is first called with a seed   
   value of 1"   
      
   This means that you will get the same value for rand for the first   
   call.   
      
   But you should clearly observe that a series of calls of rand() within   
   the same program should produce a equally-distributed series of values   
   in the range [0, RAND_MAX).   
      
   HTH & Greetings from Bremen,   
      
   Daniel Krügler   
      
      
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