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  • 函数有多个返回值

    class Program
        {
            /// <summary>
            /// 解一元二次方程
            /// </summary>
            /// <param name="a"></param>
            /// <param name="b"></param>
            /// <param name="c"></param>
            /// <param name="d"></param>
            /// <param name="e"></param>
            /// <returns></returns>
            public int jiefangcheng(int a, int b, int c, out double x1, out double x2)
            {
                x1 = 0;
                x2 = 0;
                if (a == 0)
                {
                    return 3;
                }
                else
                {
                int del = b * b - 4 * a * c;
    
    
                if (del > 0)
                {
                    x1 = (-b + Math.Sqrt(del)) / (2 * a);
                    x2 = (-b - Math.Sqrt(del)) / (2 * a);
                    return 2;
                }
                else if (del == 0)
                {
                    x1 = (-b + Math.Sqrt(del)) / (2 * a);
                    x2 = x1;
                    return 1;
                }
    
                else
                {
                    return 0;
    
                }
                }
    
            }
    
    
            static void Main(string[] args)
            {
                //解一元二次方程
                Console.Write("请输入a=");
                int a = int.Parse(Console.ReadLine());
                Console.Write("请输入b=");
                int b = int.Parse(Console.ReadLine());
                Console.Write("请输入c=");
                int c = int.Parse(Console.ReadLine());
                double x1, x2;
                int jieguo = new Program().jiefangcheng(a,b,c,out x1,out x2);
                if(jieguo ==0)
                {
                    Console.WriteLine("方程无实根");
                }
                if (jieguo == 1)
                {
                    Console.WriteLine("方程有两个相等实根x1=x2="+x1);
                }
                if (jieguo == 2)
                {
                    Console.WriteLine("方程有两个相等实根x1=" + x1 + "x2=" + x2);
                }
                if (jieguo == 3)
                {
                    Console.WriteLine("不是一元二次方程");
                }
                Console.ReadLine();
            }
        }

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  • 原文地址:https://www.cnblogs.com/wang-kaifeng/p/4834635.html
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