整理—类型转换

using System; 
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            /* int a;
            a = 1;
            int b = 3;
            int c = a + b;
            Console.WriteLine(c);
            Console.ReadLine(); */

            /* Console.WriteLine("请输入变量a的值");
             string a=Console.ReadLine ();
             Console.WriteLine ("请输入变量b的值");
             string b=Console.ReadLine();
             Console.WriteLine ("a+b的和为：");
             Console.WriteLine(a+b);
          
              /*int a1=int.Parse (a);
              int b1=int.Parse (b);
              int c=a1+b1;
              Console.WriteLine (c);
              Console.ReadLine ();*/

            /* Console.ReadLine();
             int a1 = int.Parse(a);
             int b1 = Convert.ToInt16(b);
             int c = a1 + b1;
             Console.WriteLine(c);*/

            /*double a1 = double.Parse(a);
            double b1 = Convert.Todouble16(b);
            double c = a1 + b1;
            Console.WriteLine(c);*/
            /*int a1 = int.Parse(a);

            int b1 = Convert.ToInt16(b);
            int c = a1 - b1;
            Console.WriteLine(c);*/
            /*double a1 = double.Parse(a);
            double b1 = Convert.Todouble16(b);
            double c = a1 * b1;
            Console.WriteLine(c);*/
            /*int a, b;
            a=6;
            b = 2;
            a = a - b;
            Console.WriteLine(a);*/

            /* int a=1;
             int b = 2;
             string s = a.ToString() + b.ToString();*/
            /* double a =1;
             int b = 3;
             double c = a + b;*/
            /* double a = 1.4;
             int b = 4;
             int c = (int)a + b;

             Console.WriteLine(c);

           

            

             Console.ReadLine();*/