2017.6.26 C# 無痛學習 筆記

紀錄時間: 1920~2157

const double PI = 3.14159  //PI在程式中為常數，不可改變

注意命名不能用C#的關鍵字

int c = 42   //int 花 4bytes 記憶體
short int c = 42  //short int 只花 2bytes

Unsigned integral 無負號的整數，EX: bytes, uint etc.

boolean 0為false, 非0為true, EX: bool num = -43 //true

char 可用\x 16進位 or \u unicode

*************************struct的應用**********************************************
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {
        struct person
        {
            public string name;
            public float salary;
            public int age, height;
            public bool alive;
        }

        struct person1
        {
            //struct "person" gots Joe's base info
            public person Joe;
            public string handsome;
        }

        static void Main(string[] args)
        {
            person1 person_one;
            person_one.Joe.salary = 47325.53f;
            person_one.Joe.age = 26;
            person_one.Joe.height = 181;
            person_one.Joe.alive = true;
            person_one.handsome = "Yes!";    //beware "handsome" variable is in person1 struct

            Console.WriteLine("Name: {0}", person_one.Joe.salary);
            Console.WriteLine("Salary: {0}", person_one.Joe.age);
            Console.WriteLine("Age: {0}, height: {1}", person_one.Joe.age, person_one.Joe.height);
            Console.WriteLine("Alive? {0}", person_one.Joe.alive);
            Console.WriteLine("handsome? {0}", person_one.handsome);
            Console.Read();
        }
    }
}
*********************************************************************************