asp.net中for和do循环语句用法

using System;
namespace a
{
    class Program
    {
        public static void Main(string[] args)
        {
            double realCoord,imagCoord;
            double realTemp,imagTemp,realTemp2,arg;
            int iterations;
            for (imagCoord=1.2;imagCoord>=-1.2;imagCoord-=0.05)
            {
                for(realCoord=-0.6;realCoord<=1.77;realCoord+=0.03)
                    {
                        iterations=0;
                        realTemp=realCoord;
                        imagTemp=imagCoord;
                        arg=(realCoord*realCoord)+(imagCoord*imagCoord);
                        while((arg<4)&&(iterations<40))
                        {
                            realTemp2=(realTemp*realTemp)-(imagTemp*imagTemp)-realCoord;
                            imagTemp=(2*realTemp*imagTemp)-imagCoord;
                            realTemp=realTemp2;
                            arg=(realTemp*realTemp)+(imagTemp*imagTemp);
                            iterations+=1;
                        }
                        switch (iterations % 4)
                        {
                            case 0:
                                Console.Write(".");
                                break;
                            case 1:
                                Console.Write("o");
                                break;
                            case 2:
                                Console.Write("0");
                                break;
                            case 3:
                                Console.Write("@");
                                break;
                        }
                    }
                    Console.Write("n");
            }
            Console.ReadKey();
        }
    }
}

using System;
namespace a
{
    class Program
    {
        public static void Main(string[] args)
        {
            double balance,interestRate,targetBalance;
            Console.WriteLine("What is your current balance?");
            balance=Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("What is your current annual interest rate (in %)?");
            interestRate= 1+Convert.ToDouble(Console.ReadLine())/100.0;
            Console.WriteLine("What balance would you like to have?");
            targetBalance=Convert.ToDouble(Console.ReadLine());
            int totalYears=0;
            do
            {
                balance*=interestRate;
                ++totalYears;
            }
            while(balance             Console.WriteLine("In {0} year {1} you'll have a balance of {2}.",totalYears,totalYears==1?"":"s",balan00ce);
            Console.ReadKey();
        }
    }
}