Tutorial 4

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

namespace tutorial_4
{
    class Program
    {
        static void Main(string[] args)
        {
            //1.using values
            double x = 5;
            double y = 4;
            Console.WriteLine("5+4={0}", GetSum(x, y));
            Console.WriteLine("x{0}", x);

            //2.using mathod and variable 
            int solution;
            DoubleIt(15, out solution);//create a method called Double It, pass in 15, store it in solution
            Console.WriteLine("15*2={0}", solution);

            //3.using reference,pass by reference
            int num1 = 10;
            int num2 = 20;
            Console.WriteLine("Before Swap num1:{0} num2:{1}", num1, num2);
            Swap(ref num1, ref num2);
            Console.WriteLine("After Swap num1:{0} num2:{1}", num1, num2);

            /*4.parameter, By using the params keyword, 
             * you can specify a method parameter that takes a variable number of arguments.*/
            Console.WriteLine("1+2+3={0}", GetSumMore(1, 2, 3));

            //5. If you are using parameter, you can input the date in different sequence, 
            //as long as you give them names
            PrintInfo(zipCode: 15147, name: "Leilei Xia");

            //6.A function with two data input way
            Console.WriteLine("5+4={0}", GetAnotherSum("5", "4.5"));


            //7.enum, using symbolic name to represent data
            //感觉这个真的超好用的！！
            CarColor car1 = CarColor.Blue;
            PaintCar(car1);


            Console.ReadLine();
        }
        //*2.
        static void DoubleIt(int x, out int solution)
        {
            solution = x * 2;
        }

        //1.*
        static double GetSum(double x = 1, double y = 1)//you can define a value in method itself
        {
            double temp = x;
            x = y;
            y = temp;

            return x + y;

        }

        //3.*
        public static void Swap(ref int num1,ref int num2)
        {
            int temp = num1;
            num1 = num2;
            num2 = temp;
        }

        //4*
        static double GetSumMore(params double[] nums)
        {
            double sum = 0;
            foreach (int i in nums)//it's important to use foreach so that we can input multiple numbers
            {
                sum += i;//sum=sum+i
            }
            return sum;
        }

        //5.*
        static void PrintInfo(string name, int zipCode)
        {
            Console.WriteLine("{0} lives in the zip code{1}", name, zipCode);
        }

        //6.*
        static double GetAnotherSum(double x=1, double y = 1)
        {
            return x + y;
        }
        static double GetAnotherSum(string x = "1", string y = "1")//remember to change the parameter as well
            //even the name of the functions are the same, we use method overloading, it's gonna call the right one
        {
            double dblX = Convert.ToDouble(x);
            double dblY = Convert.ToDouble(y);
            return dblX + dblY;
        }

        //7.*
        enum CarColor : byte
        {
            Orange = 1,
            Blue,
            Green,
            Red,
            Yellow
        }
        static void PaintCar(CarColor cc)
        {
            Console.WriteLine("The car was painted {0} with the code{1}", cc,(int)cc);
        }
    }
}