Random r = new Random();
double a = 1.3;
double b = 1.4;
var next = r.NextDouble() * (b - a);
next += a;
Console.WriteLine(next);
Console.ReadLine();
double a = 1.3;
double b = 1.4;
var next = r.NextDouble() * (b - a);
next += a;
Console.WriteLine(next);
Console.ReadLine();
要求产生一个(a,b)之间的数