using System;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            Cat cat = new Cat();//不含参数的构造方法
            Console.WriteLine("姓名是{0}，年龄是{1}",cat.name,cat.age);
            Cat cat1 = new Cat("一只猫");//含1个参数的构造方法
            Console.WriteLine("姓名是{0}，年龄是{1}", cat1.name, cat1.age);
            Cat cat2 = new Cat("又一只猫",18);//含2个参数的构造方法
            Console.WriteLine("姓名是{0}，年龄是{1}", cat2.name, cat2.age);
        }
        class Cat
        {
            public string name;
            public int age;
            public Cat() { }
            public Cat(string nameValue)
            {
                name = nameValue;
            }
            public Cat(string nameValue, int ageValue)
            {
                name = nameValue;
                age = ageValue;
            }
        }
    }
}

using System;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            int c = Calculate.Divide(7, 3);
            Console.WriteLine(c);
            double d = Calculate.Divide(7, 3.0);
            Console.WriteLine(d);
        }
        /// <summary>
        /// 方法名称一样 参数类型不一样 构成重载
        /// </summary>
        class Calculate
        {
            public static int Divide(int a,int b) {
                return a / b;
            }
            public static double Divide(double a, double b)
            {
                return a / b;
            }
        }
    }
}