如何从c中的[0-5] U [8-12]之类的间隔生成随机数

Question

我想从[0-5] U [8-12]生成一个随机数，当我想从[0-5]生成一个数时，我只是写x = rand（）％6，但是正如我所见想要从2个间隔的并集生成x

Answer 1

1. Generate a random number i in the range [0, 11).*

2. Define const unsigned int a[11] = { 0, 1, 2, 3, 4, 5, 8, 9, 10, 11, 12 };

3. Return a[i] .

_{*) This is probably a lot harder than you think, depending on what you think you're achieving.}