arithmeticoperators.cs

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using System;

namespace Example_5
{
	/// <summary>
	/// 此程序演示如何用算术运算符来
	/// 求二次方程的根。
	/// </summary>
	public class ArithmeticOperators
	{
		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			// x2 的系数
			int coefficient1 = 2;
			// x 的系数
			int coefficient2 = -7;
			// 二次方程的常数值
			int constant = 3;
			// 存放表达式 b2 - 4ac 的值
			double expression = 0;
			double x1 = 0;
			double x2 = 0;
			
			Console.WriteLine("二次方程为： {0}x2 + {1}x + {2}", coefficient1, coefficient2, constant);
			expression = Math.Sqrt(coefficient2 * coefficient2 - (4 * coefficient1 * constant));
			x1 = ((-coefficient2) + expression) / (2 * coefficient1);
			x2 = ((-coefficient2) - expression) / (2 * coefficient1);
			Console.Write("x = {0:F2} ", x1);
			Console.Write(" 或 ");
			Console.WriteLine("x = {0:F2}", x2);
		}
	}
}