initial commit

ClosestResolution/Form1.cs

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+namespace ClosestResolution
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void TextChanged(object sender, EventArgs e)
+        {
+            //try get int from textbox
+            if (int.TryParse(txtX.Text, out int width) && int.TryParse(txtY.Text, out int height))
+            {
+                //get closest resolution
+                var closest = ClosestResolution(width, height);
+                //set label text
+                lblX.Text = closest.Width.ToString();
+                lblY.Text = closest.Height.ToString();
+            }
+            else
+            {
+                lblX.Text = "Error";
+                lblY.Text = "Error";
+            }
+        }
+
+        private Size ClosestResolution(int width, int height)
+        {
+            //always go down in size in only one dimension
+            if (width > height) //landscape
+            {
+                if ((width / 3) * 4 > height) //height needs to be kept
+                {
+                    return new Size((height * 4) / 3, height);
+                }
+                else
+                {
+                    return new Size(width, (width * 3) / 4);
+                }
+            }
+            else //portrait
+            {
+                if ((height / 3) * 4 < width) //width needs to be kept
+                {
+                    return new Size(width, (width * 4) / 3);
+                }
+                else
+                {
+                    return new Size((height * 3) / 4, height);
+                }
+            }
+        }
+    }
+}