using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _20200717_002
{
class Program
{
static void Main(string[] args)
{
int iNum1, iNum2;
double dNum3;
//Console.WriteLine(iNum1);
//Console.WriteLine(iNum2);
while (true)
{
try
{
Console.Write("숫자를 입력해주세요 : ");
iNum1 = int.Parse(Console.ReadLine());
if(iNum1 < 0)
{
Exception exception = new Exception();
throw exception;
}
Console.Write("숫자를 입력해주세요 : ");
iNum2 = int.Parse(Console.ReadLine());
if(iNum2 < 0)
{
Exception exception = new Exception();
throw exception;
}
dNum3 = iNum1 / iNum2;
Console.WriteLine(dNum3);
}
catch (FormatException)
{
Console.WriteLine("숫자가 아닌 것을 입력하였습니다.");
continue;
}
catch (DivideByZeroException)
{
Console.WriteLine("0으로 나눌 수 없습니다.");
continue;
}
catch (Exception)
{
Console.WriteLine("오류 발생!");
continue;
}
finally
{
Console.WriteLine("무조건 실행함");
}
break;
}
}
}
}
예제 실행 화면
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _20200717_003
{
class Coordinate
{
public int x;
public int y;
}
class Program
{
static Coordinate test()
{
return new Coordinate();
}
static void Main(string[] args)
{
Coordinate c1 = new Coordinate();
Coordinate c2 = new Coordinate();
c1.x = 1;
c1.y = 2;
c2.x = 1;
c2.y = 2;
Console.WriteLine($"c1 = {c1.x}, {c1.y}");
Console.WriteLine($"c2 = {c2.x}, {c2.y}");
if(c1 == c2)
{
Console.WriteLine("c1, c2는 같습니다.");
}
else
{
Console.WriteLine("c1, c2는 다릅니다.");
}
c1 = c2;
if (c1 == c2)
{
Console.WriteLine("c1, c2는 같습니다.");
}
else
{
Console.WriteLine("c1, c2는 다릅니다.");
}
c1.x = 100;
Console.WriteLine($"c1 = {c1.x}, {c1.y}");
Console.WriteLine($"c2 = {c2.x}, {c2.y}");
}
static void Main1(string[] args)
{
Coordinate c = test();
c.x = 1;
c.y = 2;
Console.WriteLine($"c = {c.x}, {c.y}");
try
{
c = null;
c.x = 1;
}
catch (NullReferenceException)
{
Console.WriteLine("객체가 없습니다.");
}
}
}
}
예제 실행 화면
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp1
{
class Vehicle
{
public void Test()
{
Console.WriteLine("탈 것");
}
}
class Car : Vehicle
{
public new void Test()
{
Console.WriteLine("자동차");
}
}
class Program
{
static void Main(string[] args)
{
//Vehicle[] array = new Vehicle[] { new Vehicle(), new Car(), new Vehicle() };
//foreach (var item in array)
//{
// Console.WriteLine(item);
//}
//Vehicle avehicle = new Vehicle();
//Car acar = new Car();
//if(avehicle is Car)
//{
// acar = (Car)avehicle;
//}
//acar = avehicle as Car;
//if(acar == null)
//{
// Console.WriteLine("null");
//}
//Console.WriteLine(acar);
Object[] aObject = new Object[] { new Vehicle(), new Car(), new Vehicle(), new Car(), new Vehicle(), new Vehicle() };
Car acar;
foreach (Object item in aObject)
{
if((acar = item as Car) == null)
{
Vehicle avehicle = (Vehicle)item;
Console.WriteLine("Vehicel 타입");
}
else
{
Console.WriteLine("Car 타입");
}
}
}
static void Main2(string[] args)
{
Vehicle vehicle = new Vehicle();
Car car = new Car();
try
{
car = (Car)vehicle;
car.Test();
}
catch (InvalidCastException)
{
Console.WriteLine("잘못된 캐스팅입니다.");
}
}
static void Main1(string[] args)
{
Vehicle vehicle = new Vehicle();
Car car = new Car();
Vehicle a = car;
Car b = (Car)a;
}
}
}
예제 실행 화면
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp2
{
class Asian { }
class American { }
class Program
{
static void Main(string[] args)
{
Object aHuman = new Asian();
Asian aAsian;
American aAmerican;
aAsian = (Asian)aHuman;
aAmerican = (American)aHuman;
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp3
{
class Program
{
static void Main(string[] args)
{
int iNum = 100;
Object aObject = iNum;
int iNum2 = (int)aObject;
Console.WriteLine(iNum);
Console.WriteLine(aObject);
Console.WriteLine(iNum2);
}
}
}
예제 실행 화면
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp4
{
public class PropertyTest
{
private string _name;
private int _readonly;
private int _writeonly;
private static int _Static;
public string Name
{
get { return _name; }
set { _name = value; }
}
public int Readonly
{
get { return _readonly; }
}
public int Writeonly
{
set { _writeonly = value; }
}
public static int Static
{
get { return _Static; }
set { _Static = value; }
}
}
class Program
{
static void Main(string[] args)
{
PropertyTest pt = new PropertyTest();
pt.Name = "헬로 키티";
Console.WriteLine(pt.Name);
//pt.Readonly = 100;
Console.WriteLine(pt.Readonly);
pt.Writeonly = 100;
//Console.WriteLine(pt.Writeonly);
PropertyTest.Static = 200;
Console.WriteLine(PropertyTest.Static);
}
}
}
예제 실행 화면
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp5
{
class Test
{
private string[] _array;
public string this[int Index]
{
get { return _array[Index]; }
set { _array[Index] = value; }
}
}
class IndexerTest
{
private Hashtable myFavorite = new Hashtable();
public string this[string kind]
{
get { return (string)myFavorite[kind]; }
set { myFavorite[kind] = value; }
}
static void Main(string[] args)
{
IndexerTest it = new IndexerTest();
it["fruit"] = "apple";
it["color"] = "blue";
Console.WriteLine(it["fruit"]);
Console.WriteLine(it["color"]);
Test test = new Test();
test[0] = "test";
}
}
}
