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

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   Message 242,531 of 243,242   
   Ike Naar to John McCue   
   Re: srand(0)   
   23 Dec 25 06:49:22   
   
   From: ike@sdf.org   
      
   On 2025-12-23, John McCue  wrote:   
   > Michael Sanders  wrote:   
   >> Is it incorrect to use 0 (zero) to seed srand()?   
   >>   
   >> int seed = (argc >= 2 && strlen(argv[1]) == 9)   
   >>            ? atoi(argv[1])   
   >>            : (int)(time(NULL) % 900000000 + 100000000);   
   >>   
   >> srand(seed);   
   >>   
   >   
   > I like to just read /dev/urandom when I need a random   
   > number.  Seem easier and more portable across Linux &   
   > the *BSDs.   
   >   
   > int s;   
   > read(fd, &s, sizeof(int));   
      
   srand takes an unsigned argument.   
      
     unsigned s;   
     read(fd, &s, sizeof s);   
      
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