random numbers:

[samtheman]

Can someone give me the best and easy codes to create random numbers?

[keskiverto]

Read http://www.cplusplus.com/reference/random/
All of it.

[Peter87]

Seriously? It's not necessary to read up on all the engines and all the distributions.
If I had to pick just one engine I would go for std::mt19937 (Mersenne Twister).
And if I had to pick just one distribution I would go for std::uniform_int_distribution which allows you generate random numbers within a range with equal probability.