first commit

listas3/source/exercicio4.cs

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+using System;
+
+namespace exercicios
+{
+	class Exercicio4{
+			public static void Init()
+			{
+				double a,b,c;
+				
+				Console.WriteLine("Insert the triangle's dimensions (A,B,C)");
+				
+				a = double.Parse(Console.ReadLine());
+				b = double.Parse(Console.ReadLine());
+				c = double.Parse(Console.ReadLine());
+				
+				
+				
+				if(a < (b+c) && b < (a+c) && c < (a+b))
+				{
+					Console.WriteLine(TriEquil(a,b,c) == true ?
+						"Equilateral" : TriIso(a,b,c) == true ?
+						"Isosceles" : TriEsc(a,b,c) == true ?
+						"Scalene" : "N. A.");
+				}
+				else
+				{
+					Console.WriteLine("Not a triangle.");
+				}
+				
+			}
+			static bool TriEquil(double a, double b, double c)
+			{
+				if (a == b && b == c)
+				{
+					return true;
+				}
+				else
+				{
+					return false;
+				}
+			}
+			static bool TriIso(double a, double b, double c)
+			{
+				if (a == b || a == c || b == c)
+				{
+					return true;
+				}
+				else
+				{
+					return false;
+				}
+			}
+			static bool TriEsc(double a, double b, double c)
+			{
+				
+				if((TriIso(a,b,c) && TriEquil(a,b,c)) == false)
+				{
+					return true;
+				}
+				else {return false;}
+			}
+	}
+}