static void Main(string[] argv)
{
//structs
//create the object, assign values, print it
Rectangle rect1;
rect1.lenght = 200;
rect1.width = 50;
Console.WriteLine("Area of react 1 : {0}",
rect1.Area());
Rectangle rect2 = new Rectangle(100, 40);
rect2 = rect1;
rect1.lenght = 33;
Console.WriteLine("Area of rectan 2 : {0}",
rect2.lenght);
//classes - teh main diference between structs is that
//classes has inerithence
//this exist only for stopping the console from opening
Animal fox = new Animal()
{
name = "red",
sound = "raww"
};
Animal cat = new Animal("Hannah", "meow");
fox.MakeSound();
cat.MakeSound();
Console.WriteLine("# of animals : {0}", Animal.GetNumAnimal());
//using shapeMath class
Console.WriteLine("area of rectangle {0}",
ShapeMath.GetArea("rectangle", 5, 5));
//null
int?randNum = null; //need ? to be assigned
//check if is null
if (randNum == null)
{
Console.WriteLine("randNum is null");
}
Console.ReadLine();
}
static void Main(string[] args)
{
// Create a Rectangle
Rectangle rect1;
// Add values to it and run the Area method
rect1.length = 200;
rect1.width = 50;
Console.WriteLine("Area of rect1 : {0}",
rect1.Area());
// Use a constructor to create a Rectangle
Rectangle rect2 = new Rectangle(100, 40);
// If you assign one Rectangle to another
// you are setting the values and not
// creating a reference
rect2 = rect1;
rect1.length = 33;
Console.WriteLine("rect2.length : {0}",
rect2.length);
// ----- OBJECT ORIENTED PROGRAMMING -----
// A class models real world objects by
// defining their attributes (fields) and
// capabilities (methods)
// Then unlike with structs you can
// inherit from a class and create more
// specific subclass types
// Add a class Project -> Add Class
// Create an Animal object
// You could also assign values like
// fox.name = "Red"
Animal fox = new Animal()
{
name = "Red",
sound = "Raaaw"
};
// Call the static method
Console.WriteLine("# of Animals {0}",
Animal.GetNumAnimals());
// You can also create static utility
// classes Project -> Add Class
Console.WriteLine("Area of Rectangle : {0}",
ShapeMath.GetArea("rectangle", 5, 6));
// ----- NULLABLE TYPES -----
// Data types by default cannot have a
// value of null. Often null is needed
// when you are working with databases
// and you can create a null type by
// adding a ? to the definition
int?randNum = null;
// Check for null
if (randNum == null)
{
Console.WriteLine("randNum is null");
}
// Another check for null
if (!randNum.HasValue)
{
Console.WriteLine("randNum is null");
}
Console.ReadLine();
}
public static void practice1()
{
Console.WriteLine(String.Empty);
Console.WriteLine("Struct");
Console.WriteLine("=======================");
Rectangle rect1;
rect1.width = 100;
rect1.length = 30;
rect1.print();
// Console.WriteLine("[L] width{0}, length:{1}, Area{2}", rect1.width, rect1.length, rect1.Area());
Rectangle rect2 = new Rectangle(200, 50);
rect2.print();
//Console.WriteLine("[L] width{0},, length:{1}, Area{2}", rect2.width, rect2.length, rect2.Area());
Console.WriteLine(String.Empty);
Console.WriteLine("Class Animal");
Console.WriteLine("=======================");
List <Animal> animals = new List <Animal>();
animals.Add(new Animal("fox", "Raww"));
animals.Add(new Animal("dog", "Woof"));
animals.Add(new Animal("cat", "Mewww"));
/* // 바로 아래 foreach와 같음
* for (int i = 0; i < animals.Count; i++)
* {
* Animal thisAnimal = animals[i];
* }
*/
bool bFound = false;
foreach (var animal in animals)
{
var animalName = animal.GetName();
if (animalName == "pig")
{
bFound = true;
break;
}
}
if (bFound)
{
Console.WriteLine("pig found");
}
else
{
Console.WriteLine("pig not found");
}
foreach (var animal in animals)
{
//var animalNamePub = animal.name; - private이기떄문에 안됨
var animalName = animal.GetName();
if (animalName == "cat")
{
Console.WriteLine("Found cat");
Console.WriteLine(">>");
animal.MakeSound();
}
//animal.MakeSound();
}
Animal myCat = null; // = Animal myCat = animals.Find( ...
myCat = animals.Find(item => item.GetName().Equals("cat"));
if (myCat != null)
{
Console.WriteLine("Found my cat again");
Console.WriteLine(">>");
myCat.MakeSound();
}
Animal myPig = animals.Find(item => item.GetName().Equals("pig"));
if (myPig != null)
{
Console.WriteLine("Found pig");
myPig.MakeSound();
}
else
{
Console.WriteLine("pig not found");
}
Dictionary <enAnimalType, Animal> dicAnimals = new Dictionary <enAnimalType, Animal>();
dicAnimals.Add(enAnimalType.fox, new Animal("red", "Raww"));
dicAnimals.Add(enAnimalType.dog, new Animal("blue", "Woof"));
dicAnimals.Add(enAnimalType.cat, new Animal("pink", "Meww"));
var someAnimal = dicAnimals[enAnimalType.cat]; // foreach (var animal in animals), Animal my Cat (위의 2개) 2개 하고 동일
foreach (KeyValuePair <enAnimalType, Animal> item in dicAnimals)
{
var key = item.Key;
var value = item.Value;
value.MakeSound();
}
foreach (var item in dicAnimals.Values)
{
item.MakeSound();
}
Animal outAnimal;
if (dicAnimals.TryGetValue(enAnimalType.pig, out outAnimal))
{
outAnimal.MakeSound();
}
else
{
Console.WriteLine("[E] pig not found");
}
var pig = dicAnimals[enAnimalType.fox];
/* //위랑 같은내용
* var cat = new Animal("고양이", "Mewww");
*
* cat.MakeSound();
*
*
* var dog = new Animal("개", "woof");
*
*
* dog.MakeSound();
*
*
* var fox = new Animal("여우", "How"); // Animal = Class, fox = instance, new Animal = 생성자, ("여우","How") = 파라미터
*
* fox.MakeSound(); // function
*/
Console.WriteLine("numberOfAnimals : {0}", Animal.GetNumOfAnimals());
Console.WriteLine(String.Empty);
Console.WriteLine("ShapeMath");
Console.WriteLine("==========================");
Console.WriteLine("Area of Rectangle : {0}", ShapeMath.GetArea(enShape.Rectangle, 5, 6));
Console.WriteLine("Area of Rectangle : {0}", ShapeMath.GetArea(enShape.Triangle, 5, 6));
Console.WriteLine("Area of Rectangle : {0}", ShapeMath.GetArea(enShape.Circle, 5));
Console.ReadLine();
}