i want to generate unique id in c. what should i do?

Question

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Answer 1

you could generate a random string , then use a hashmap to cache the result. if you generate a string already in cache you throw away the result & regenerate to make sure its unique. If it is unique? Store it in cache and return it.

advantage is hashmap lookup time is 0(1) best case , so its as fast as accessing array element.

Answer 2

can i ask. what is id, a unique string or unique number??

Answer 3

string