added exo

Algorithms/Program.cs

@@ -8,10 +8,8 @@ class EntryPoint{
 
 
     public static void Main(String[] args){
-        Point point1 = new Point(3, 4);
-        Point point2 = new Point(-3, -4);
-        Point midPoint = point1.MidPointOf(point2);
+       
 
-        Console.WriteLine("Hello World From A Class: " + midPoint.X() + ", " + midPoint.Y());
+        Console.WriteLine(TriangleExercice.BuildTriangle(6) );
     }
 }

Algorithms/TriangleExercice.cs

@@ -0,0 +1,34 @@
+namespace Algorithms;
+
+using System;
+using System.Numerics;
+using System.Xml.Serialization;
+
+public class TriangleExercice
+{
+    public static string Repeat(string s, int n)
+    {
+        string ret = "";
+        for (int i = 0; i < n; i++)
+        {
+            ret = ret + s;
+        }
+        return ret;
+    }
+
+    public static string BuildTriangle(int height)
+    {
+        string ret = "";
+        for (int i = 0; i < height; i++)
+        {
+            int nbrStarts = 2 * i + 1;
+            int nbrSpaces = height - (i + 1);
+            string spaces = Repeat("_", nbrSpaces);
+            string starts = Repeat("*", nbrStarts);
+            ret += "" + spaces + starts + "\n";
+
+        }
+        return ret;
+    }
+
+}