Random and negative numbers

Question

I have to generate numbers in range [-100; +2000] in c++. How can I do this with rand if there is only positive numbers available? Are there any fast ways?<

Answer 1

You can use the C++ TR1 random functions to generate numbers in the desired distribution.

std::random_device rseed;
std::mt19937 rng(rseed());
std::uniform_int_distribution dist(-100,2100);

std::cout << dist(rng) << '\n';