c# 由用户输入a,b,c求一元二次方程根的程序

public static void Main()
{
double a, b, c;
Console.Write("a=");
a = Convert.ToDouble(Console.ReadLine());
Console.Write("b=");
b = Convert.ToDouble(Console.ReadLine());
Console.Write("c=");
c = Convert.ToDouble(Console.ReadLine());
Console.WriteLine(a + "x^2+" + b + "x+" + c + "=0");
double d = b * b - 4 * a * c;
double x1, x2;
if (d > 0)
{
x1 = (-b - Math.Sqrt(d)) / 2.0 / a;
x2 = (-b + Math.Sqrt(d)) / 2.0 / a;
Console.WriteLine("方程有两个不同的实根\nx1={0}\nx2={1}", x1, x2);
}
else if (d == 0)
{
x1 = x2 = (-b) / 2.0 / a;
Console.WriteLine("