Creating the scaffold of the calculator

main.vala

@@ -1,39 +1,39 @@
 public class Main : Gtk.Application {
-  public Main() {
+	public Main() {
-    Object (application_id: "com.example.App");
+		Object (application_id: "com.example.App");
-  }
+	}
 
-  public override void activate () {
+	public override void activate () {
-    var win = new Gtk.ApplicationWindow (this);
+		var win = new Gtk.ApplicationWindow (this);
-    win.set_title("Calculator");
+		win.set_title("Calculator");
 
-    var display = new Gtk.Label("Display");
+		var display = new Gtk.Label("Display");
-    display.xalign = 1.0f;
+		display.xalign = 1.0f;
-    var grid = new Gtk.Grid();
+		var grid = new Gtk.Grid();
 
-    grid.attach(display, 0, 0, 3);
+		grid.attach(display, 0, 0, 3);
-    // Procedurlly generating numbered buttons 1-9
+		// Procedurlly generating numbered buttons 1-9
-    for (int col = 0; col < 3; col++) {
+		for (int col = 0; col < 3; col++) {
-        for (int row = 0; row < 3; row++){
+			for (int row = 0; row < 3; row++){
-            // This math is need to orient the buttons in the correct order
+				// This math is need to orient the buttons in the correct order
-            // starting from bottom left to top right
+				// starting from bottom left to top right
-            var number = (3 - row - 1)*3 + col + 1;
+				var number = (3 - row - 1)*3 + col + 1;
-            var btn = new Gtk.Button.with_label("%d".printf(number));
+				var btn = new Gtk.Button.with_label("%d".printf(number));
-            grid.attach(btn, col, row+1);
+				grid.attach(btn, col, row+1);
-        }
+			}
-    }
+		}
 
-    var zero = new Gtk.Button.with_label("0");
+		var zero = new Gtk.Button.with_label("0");
-    var equal = new Gtk.Button.with_label("=");
+		var equal = new Gtk.Button.with_label("=");
-    grid.attach(zero, 0, 4);
+		grid.attach(zero, 0, 4);
-    grid.attach(equal, 1, 4);
+		grid.attach(equal, 1, 4);
 
-    win.child = grid;
+		win.child = grid;
-    win.present ();
+		win.present ();
-  }
+	}
 
-  public static int main (string[] args) {
+	public static int main (string[] args) {
-    var app = new Main();
+		var app = new Main();
-    return app.run (args);
+		return app.run (args);
-  }
+	}
 }