指標 PointerPlayground2 樣本

using System;namespace exercise {    class Program {        static unsafe void Main(string[] args) {            //PointerPlayground2 該樣本介紹指標的算術，以及結構指標和類成員指標。開始時，定義一個結構CurrencyStruct，            //它把貨幣值表示為美元和美分，再定義一個等價的類CurrencyClass：            //查看儲存在棧中的項的地址            Console.WriteLine("Szie of CurrencyStruct sturct is " + sizeof(CurrencyStruct));            CurrencyStruct amount1, amount2;            CurrencyStruct* pAmount = &amount1;            long* pDollars = &pAmount->Dollars;            byte* pCents = &(pAmount->Cents);            Console.WriteLine("Address of amount1 is 0x{0:X}", (uint)&amount1);            Console.WriteLine("Address of amount2 is 0x{0:X}", (uint)&amount2);            Console.WriteLine("Address of pAmount is 0x{0:X}", (uint)&pAmount);            Console.WriteLine("Address of pDollars is 0x{0:X}", (uint)&pAmount);            Console.WriteLine("Address of pCents is 0x{0:X}", (uint)&pCents);            pAmount->Dollars = 20;            *pCents = 50;            Console.WriteLine("amount1 contains " + amount1);            //查看儲存在堆中的項的地址            Console.WriteLine("\nNow with classes");            //now try it out with classes            CurrencyClass amount3 = new CurrencyClass();            fixed(long* pDollars2 = &amount3.Dollars)            fixed(byte* pCents2 = &(amount3.Cents)) {                Console.WriteLine("amount3,Dollars has address 0x{0:X}", (uint)pDollars2);                Console.WriteLine("amount3.Cents has address 0x{0:X}", (uint)pCents2);                *pDollars2 = -100;                Console.WriteLine("amount3 conteans " + amount3);            }        }    }    internal struct CurrencyStruct {        public long Dollars;        public byte Cents;        public override string ToString() {            return "$" + this.Dollars + "." + this.Cents;        }    }    internal class CurrencyClass {        public long Dollars;        public byte Cents;        public override string ToString() {            return "$" + this.Dollars + "." + this.Cents;        }    }}