we all know，For example, Swift 、 Python,，You do not need to declare a special variable type - although they are type-safe languages，But it can help you to dynamically infer the type of a variable in context。
Python do what you do，Write a name is the default declare a variable；And Swift，It is more close to our topic，It also uses[crayon-6766b[……]
During the development time，You will inevitably use a random number。And still more when，We need to generate a series of random numbers numeric string spare。Fortunately, however, a variety of programming language provides a simple and easy to use pseudo-random number generator for your use，For example, in the C # Random。
but，C # is the default system clock Random seed - this method is simple and crude，Unfortunately, the event generated a lot over a short time[……]