输入三个数自动判定是否能构成三角形

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication22
{
class Program
{
static void Main(string[] args)
{
double a, b, c;
Console.WriteLine("请输入一个值给a");
a = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("请输入一个值给b");
b = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("请输入一个值给c");
c = Convert.ToDouble(Console.ReadLine());
if (a + b <= c || a + c <= b || b + c <= a) Console.WriteLine("不构成三角形");
if (a + b > c && a + c > b && b + c > a)
{
Console.WriteLine("可以构成三角形");
if (a == b && b == c) Console.WriteLine("构成等边三角形");
if (a == b ||a  == c || b == c) Console.WriteLine("构成等腰三角形");
if (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a) Console.WriteLine("构成直角三角形");
}
Console.Read();
}
}
}