Test UI done enough, start working on how to get the input into an Expense.

lib/main.dart

@@ -12,7 +12,10 @@ class MainApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    const recurranceValues = <DropdownMenuEntry>[
+    const inputWidth = 400.0;
+    const inputHeight = 50.0;
+
+    const recurrenceValues = <DropdownMenuEntry>[
       DropdownMenuEntry(value: "D", label: "Daily"),
       DropdownMenuEntry(value: "W", label: "Weekly"),
       DropdownMenuEntry(value: "B", label: "Biweekly"),
@@ -20,35 +23,38 @@ class MainApp extends StatelessWidget {
       DropdownMenuEntry(value: "Y", label: "Yearly")
     ];
 
+    var cost;
+
     return const MaterialApp(
       home: Scaffold(
         body: Center(
           child: Column(mainAxisSize: MainAxisSize.min, spacing: 10, children: [
             Text('Input an expense below!'),
             SizedBox(
-                width: 400,
-                height: 50,
+                width: inputWidth,
+                height: inputHeight,
                 child: TextField(
                   keyboardType: TextInputType.text,
                   decoration: InputDecoration(hintText: "Expense Name"),
+                  // https://docs.flutter.dev/cookbook/forms/retrieve-input
+
                 )),
             SizedBox(
-              width: 400,
-              height: 50,
+              width: inputWidth,
+              height: inputHeight,
               child: TextField(
                 keyboardType: TextInputType.numberWithOptions(decimal: true),
                 decoration: InputDecoration(hintText: "Expense Cost"),
               ),
             ),
             DropdownMenu(
-              dropdownMenuEntries: recurranceValues,
-              hintText: "Recurrance",
-              width: 400,
-              menuHeight: 50,
+              dropdownMenuEntries: recurrenceValues,
+              hintText: "Recurrence",
+              width: inputWidth,
             ),
             SizedBox(
-                width: 400,
-                height: 50,
+                width: inputWidth,
+                height: inputHeight,
                 child: TextField(
                   keyboardType: TextInputType.text,
                   decoration: InputDecoration(hintText: "Expense Description"),
@@ -59,3 +65,12 @@ class MainApp extends StatelessWidget {
     );
   }
 }
+
+class Expense {
+  String name;
+  double cost;
+  Enum recurrence;
+  String description;
+
+  Expense(this.name, this.cost, this.recurrence, this.description);
+}