12.输入3个数，按照从小到大的顺序输出。

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本文介绍了一个简单的C#程序，该程序接收用户输入的三个数字，并按照从小到大的顺序输出这些数字。通过基本的比较逻辑实现排序功能。

/*
 * Created by SharpDevelop.
 * User: Administrator
 * Date: 2011-7-11
 * Time: 11:54
 * 12.输入3个数，按照从小到大的顺序输出。
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;

namespace test13
{
	class Program
	{
		public static void Main(string[] args)
		{
			Console.WriteLine("Hello World!");
			
			// TODO: Implement Functionality Here
			Console.Write("Please input the one number: ");
			double num1 = double.Parse(Console.ReadLine());
			Console.WriteLine("Please input the second number: ");
			double num2 = double.Parse(Console.ReadLine());
			Console.WriteLine("Please input the third number: ");
			double num3 = double.Parse(Console.ReadLine());
			double num, one, second , third;
			one = num1;
			second = num2;
			third = num3;
			if (num1>num2)
			{
				num = num1;
				num1 = num2;
				num2 = num;
			}
			// now num1<num2
			if (num3<num1)
			{
				one = num3;
				second = num1;
				third = num2;
			}
			if (num3>num1&num3<num2)
			{
				one = num1;
				second = num3;
				third = num2;
			}
			if (num3>num2)
			{
				one = num1;
				second = num2;
				third = num3;
			}
			Console.WriteLine("{0},{1},{2}",one,second,third);
			//one is first
			
			
			Console.Write("Press any key to continue . . . ");
			Console.ReadKey(true);
		}
	}
}