本文介紹了在 C++ 應(yīng)用程序中，我應(yīng)該多久調(diào)用一次 srand()?的處理方法，對(duì)大家解決問題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)吧！
問題描述
我有一個(gè) C++ 應(yīng)用程序，它在不同的地方調(diào)用 rand().我是否需要定期初始化 srand() 以確保 rand() 是合理隨機(jī)的，還是在應(yīng)用程序啟動(dòng)時(shí)調(diào)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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