static void Main(string[] args)
{
Double A;
Double B;
Double C;
Double T;
Double X1;
Double X2;
Console.WriteLine("请输入3个数");
try
{
A = Double.Parse(Console.ReadLine());
B = Double.Parse(Console.ReadLine());
C = Double.Parse(Console.ReadLine());
if (A == 0)
{
Console.WriteLine("不是一元二次方程");
Console.ReadLine();
}
else
{
T = B * B - (4 * A * C);
if (T > 0)
{
X1 = ((-B) + Math.Sqrt(T)) / (2 * A);
X2 = ((-B) - Math.Sqrt(T)) / (2 * A);
Console.WriteLine(X1);
Console.WriteLine(X2);
Console.ReadLine();
}
if (T < 0)
{
X1 = (-B) / (2 * A);
X2 = Math.Sqrt((-T)) / (2 * A);
Console.WriteLine("X1 = {0} + {1}i",X1,X2);
Console.WriteLine("X2 = {0} - {1}i",X1,X2);
Console.ReadLine();
}
if (T == 0)
{
X1 = X2 = (-B) / (2 * A);
Console.WriteLine(X1);
Console.WriteLine(X2);
Console.ReadLine();
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.ReadLine();
}
}