C++11 random numbers

Question

I need to generate random numbers, but from as wide a range as possible (64 bit at least). I don\'t care if the distribution is perfect, so std::rand() would wo

Answer 1

Not C++11, but easy enough

((unsigned long long)rand() << 32) + rand() Here we generate two parts of int64 as int32's

As JasonD pointed out, it assumes that rand() generate 32bit integer. It' spossible to xor rand() << x, rand() << (2*x), rand() << (3*x), etc, where x <= bit's in generate by rand() number`. It should be OK too.