Creating the scaffold for my calculator app!

main.vala

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+public class Main : Gtk.Application {
+  public Main() {
+    Object (application_id: "com.example.App");
+  }
+
+  public override void activate () {
+    var win = new Gtk.ApplicationWindow (this);
+    win.set_title("Calculator");
+
+    var display = new Gtk.Label("Display");
+    display.xalign = 1.0f;
+    var grid = new Gtk.Grid();
+
+    grid.attach(display, 0, 0, 3);
+    // Procedurlly generating numbered buttons 1-9
+    for (int col = 0; col < 3; col++) {
+        for (int row = 0; row < 3; row++){
+            // This math is need to orient the buttons in the correct order
+            // starting from bottom left to top right
+            var number = (3 - row - 1)*3 + col + 1;
+            var btn = new Gtk.Button.with_label("%d".printf(number));
+            grid.attach(btn, col, row+1);
+        }
+    }
+
+    var zero = new Gtk.Button.with_label("0");
+    var equal = new Gtk.Button.with_label("=");
+    grid.attach(zero, 0, 4);
+    grid.attach(equal, 1, 4);
+
+    win.child = grid;
+    win.present ();
+  }
+
+  public static int main (string[] args) {
+    var app = new Main();
+    return app.run (args);
+  }
+}