C#异常处理

using System;
using System.Collections.Generic;
using System.Text;
namespace a08
{
    class Program
    {
        class test
        {
            public int MyInt(string a,string b)
            {
            int int1;
            int int2;
            int num;
            try
            {
                int1=int.Parse(a);
                int2=int.Parse(b);
                if(int2==0)
                {
                    throw new DivideByZeroException();
                }
                num=int1/int2;
                return num;
            }
            catch(DivideByZeroException de)
            {
                Console.WriteLine("用零除整数引发异常！");
                Console.WriteLine(de.Message);
                return 0;
            }
        }
    }
        public static void Main(string[] args)
        {
            try
            {
                Console.WriteLine("请输入分子");
                string str1=Console.ReadLine();
                Console.WriteLine("请输入分母");
                string str2=Console.ReadLine();
                test tt=new test();
                Console.WriteLine("分子除以分母的值："+tt.MyInt(str1,str2));
            }
            catch(FormatException)
            {
                Console.WriteLine("请输入数值格式的数据");
            }
        
            Console.ReadKey(true);
        }
    }
}