//有方法名，有参数个数，有参数类型，有参数顺序(参数的传递)

namespace ConsoleApplication3

{

class Program

{

public static int Add(int x, int y)//使用静态修饰词static 需要用类名.出来

{

return x + y;

}

public double Add(int x, double y)//无静态修饰词static 实例化对象.出来

{

return x + y;

}

public int Add(int x, int y,int z)

{

return x + y + z;

}

static void Main(string[] args)

{

Program program = new Program();//实例化Program类对象

int q = 3;//参数的传递与变量名无关 与参数个数，参数类型，参数顺序相关

int w = 5;

int e = 7;

double y1 = 5.5;

Console.WriteLine(q + "+" + w + "=" + Program.Add(q, w));

Console.WriteLine(q + "+" + y1 + "=" + program.Add(q, y1));

Console.WriteLine(q + "+" + w + "+" + e + "=" + program.Add(q, w, e));

Console.ReadLine();

}

}

}