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They are deterministic.

Why wouldn't one use some sort of pseudorandom seed instead of just uninitialized memory? Couldn't one sample a clock, image sensor, thermometer or some other sensor that would have a random value to use as a seed? Seems like a part of memory allocated by the compiler might always be zero.

There's no uninitialized memory. File-scoped variables are initialized to 0 in C.

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