CODEWITHSUNDEEP
c++
user3454011
user3454011

Reputation:

Generating uniformly distributed random numbers within a range in C++

I know there are similar questions.
But mine has different settings.

I don't know if it's possible to get uniformly distributed random numbers, do I have to use the random library?

Upvotes: 1

Views: 92

Answers (1)

paxdiablo
paxdiablo

Reputation: 881223

The C++ standard mostly defers to the C standard when it comes to the heritage functions like rand() and srand().

Unfortunately, there is nothing in the C standard about rand() delivering uniform distribution. In fact, it states in a footnote (my emphasis):

There are no guarantees as to the quality of the random sequence produced and some implementations are known to produce sequences with distressingly non-random low-order bits. Applications with particular requirements should use a generator that is known to be sufficient for their needs.

If you want specific properties for your random numbers, you really should be using the C++ stuff in <random> (yes, I know you appear to have discounted that but you may have to make a trade-off: either use them or have no guarantee of a specific distribution).

Upvotes: 1

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