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   comp.lang.c      Meh, in C you gotta define EVERYTHING      243,242 messages   

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   Message 242,582 of 243,242   
   Janis Papanagnou to Michael Sanders   
   Re: srand(0)   
   24 Dec 25 18:04:05   
   
   From: janis_papanagnou+ng@hotmail.com   
      
   On 2025-12-24 16:41, Michael Sanders wrote:   
   >   
   > My aims (mostly just learning my around C at this point)   
   > are *much* more simple. I needed something that is   
   > seed-able/deterministic/portable allowing the user a   
   > shot at replaying a round in a silly game I've been   
   > working on every now & again:   
   >   
   > int genseed(int seed_in) {   
   >      if (seed_in >= 10000000) return seed_in;   
   >      unsigned long t = (unsigned long)time(NULL);   
   >      unsigned long c = (unsigned long)clock();   
   >      return (int)(((t ^ c) % 80000000UL) + 10000000UL);   
   > }   
   >   
      
   If you need a portable function across different platforms   
   you may want to write an own random() function, code based   
   on some simple, proven algorithm. Or borrow a piece of code   
   from some existing public source code library.   
      
   For "_replaying_ a round in a silly game" across platforms   
   (or generally) you should not seed it with time() or other   
   random factors (as shown in your code snippet).   
      
   Janis   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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