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問題描述
我有一個 C++ 應用程序，它在不同的地方調用 rand().我是否需要定期初始化 srand() 以確保 rand() 是合理隨機的，還是在應用程序啟動時調用一次就足夠了?
I have a C++ application which calls rand() in various places. Do I need to initialize srand() regularly to ensure that rand() is reasonably random, or is it enough to call it once when the app starts?
If you have only a single thread, seed once. If you reseed often, you might actually break some of the statistical properties of the random numbers. If you have multiple threads, don't use rand at all, but rather something threadsafe like drand48_r, which lets you maintain a per-thread state (so you can seed once per thread).
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