Initial

Calculadora/Calculadora/MainPage.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace Calculadora
+{
+    public partial class MainPage : ContentPage
+    {
+        int calcState = 1;
+
+        double l_firstNumber = 0;
+        double l_secondNumber = 0;
+        double result = 0;
+
+        public MainPage()
+        {
+            InitializeComponent();
+        }
+
+        void OnAddNumber(object sender, EventArgs args)
+        {
+            if (calcState <= 1)
+            {
+                Button iButton = (Button)sender;
+                firstNumber.Text = firstNumber.Text + iButton.Text;
+            } else
+            {
+                Button iButton = (Button)sender;
+                secondNumber.Text = secondNumber.Text + iButton.Text;
+            }
+        }
+
+        void OnSelectOperator(object sender, EventArgs args)
+        {
+            Button iButton = (Button)sender;
+            mathOperator.Text = iButton.Text;
+            calcState++;
+        }
+
+        void OnCalculate(object sender, EventArgs args)
+        {
+            l_firstNumber = double.Parse(firstNumber.Text);
+            l_secondNumber = double.Parse(secondNumber.Text);
+
+            switch (mathOperator.Text)
+            {
+                case "÷":
+                    result = l_firstNumber / l_secondNumber;
+                    break;
+                case "×":
+                    result = l_firstNumber * l_secondNumber;
+                    break;
+                case "-":
+                    result = l_firstNumber - l_secondNumber;
+                    break;
+                case "+":
+                    result = l_firstNumber + l_secondNumber;
+                    break;
+            }
+
+            firstNumber.Text = Convert.ToString(result);
+
+            mathOperator.Text = "";
+            secondNumber.Text = "";
+        }
+
+        void OnClear(object sender, EventArgs args)
+        {
+            firstNumber.Text = "";
+            mathOperator.Text = "";
+            secondNumber.Text = "";
+            calcState = 1;
+        }
+    }
+}