Ejemplo n.º 1
0
        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();
        }
Ejemplo n.º 2
0
        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();
        }
Ejemplo n.º 3
0
        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();
        }