循环结构之FOR语句

本示例的FOR循环创建一个Mandelbrot图像。

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();
		}
	}
}