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I am using C++ 2012. I want to use a rand() in program that must generate random values many times (100 random number for 3000 iteration) and all of these process should be done in a second or even fewer. How can i do this. I know that "srand((unsigned int)time(NULL));" must be used as a seed for rand(). But What about these tiny bit of time while the second in time() may be the same in all 3000 iteration. I know there exist "random.h" but I am a beginner and do not know how to use it. please help.

Mehdi Tanhatalab
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Only seed your random number generator once.

srand() is used to seed the C library's random number generator (rand()). You absolutely do not want to call srand repeatedly, otherwise you ruin the psuedo-random properties of the RNG.

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Jonathon Reinhart
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