Create a simple calculator program using the Windows Applica

Create a simple calculator program using the Windows Application function within Visual Studio. You will need to use at least one form level variable and display it when the ‘=’ button is pressed. Note: the form level variable must be able to hold decimal numbers. Hint: Since the variable is used only to hold a value I would leave it a string and convert it to a number when I needed to. This will avoid some potential problems.

I should be able to put numbers into the display at the top by selecting the text box and entering numbers from the keyboard or by selecting the numbers one by one on the calculator form.

For some extra credit implement the old memory button ‘M+’ and ‘M-‘ as well as the Memory clear and memory remind ‘MC’ ‘MR’.

|Simple Calculator 123 1 2 4 5 9

Solution

//CalculatorUtilities.cs using System; using System.Windows.Controls; using System.Windows; using System.Windows.Media; using System.Globalization; namespace Microsoft.Windows.Controls.Core.Utilities { static class CalculatorUtilities { public static Calculator.CalculatorButtonType GetCalculatorButtonTypeFromText(string text) { switch (text) { case \"0\": return Calculator.CalculatorButtonType.Zero; case \"1\": return Calculator.CalculatorButtonType.One; case \"2\": return Calculator.CalculatorButtonType.Two; case \"3\": return Calculator.CalculatorButtonType.Three; case \"4\": return Calculator.CalculatorButtonType.Four; case \"5\": return Calculator.CalculatorButtonType.Five; case \"6\": return Calculator.CalculatorButtonType.Six; case \"7\": return Calculator.CalculatorButtonType.Seven; case \"8\": return Calculator.CalculatorButtonType.Eight; case \"9\": return Calculator.CalculatorButtonType.Nine; case \"+\": return Calculator.CalculatorButtonType.Add; case \"-\": return Calculator.CalculatorButtonType.Subtract; case \"*\": return Calculator.CalculatorButtonType.Multiply; case \"/\": return Calculator.CalculatorButtonType.Divide; case \"%\": return Calculator.CalculatorButtonType.Percent; case \"\\b\": return Calculator.CalculatorButtonType.Back; case \"\ \": case \"=\": return Calculator.CalculatorButtonType.Equal; } //the check for the decimal is not in the switch statement. To help localize we check against the current culture\'s decimal seperator if (text == CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator) return Calculator.CalculatorButtonType.Decimal; //check for the escape key if (text == ((char)27).ToString()) return Calculator.CalculatorButtonType.Clear; return Calculator.CalculatorButtonType.None; } public static Button FindButtonByCalculatorButtonType(DependencyObject parent, Calculator.CalculatorButtonType type) { for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++) { var child = VisualTreeHelper.GetChild(parent, i); object buttonType = child.GetValue(Button.CommandParameterProperty); if (buttonType != null && (Calculator.CalculatorButtonType)buttonType == type) { return child as Button; } else { var result = FindButtonByCalculatorButtonType(child, type); if (result != null) return result; } } return null; } public static string GetCalculatorButtonContent(Calculator.CalculatorButtonType type) { string content = string.Empty; switch (type) { case Calculator.CalculatorButtonType.Add: content = \"+\"; break; case Calculator.CalculatorButtonType.Back: content = \"Back\"; break; case Calculator.CalculatorButtonType.Cancel: content = \"CE\"; break; case Calculator.CalculatorButtonType.Clear: content = \"C\"; break; case Calculator.CalculatorButtonType.Decimal: content = CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator; break; case Calculator.CalculatorButtonType.Divide: content = \"/\"; break; case Calculator.CalculatorButtonType.Eight: content = \"8\"; break; case Calculator.CalculatorButtonType.Equal: content = \"=\"; break; case Calculator.CalculatorButtonType.Five: content = \"5\"; break; case Calculator.CalculatorButtonType.Four: content = \"4\"; break; case Calculator.CalculatorButtonType.Fraction: content = \"1/x\"; break; case Calculator.CalculatorButtonType.MAdd: content = \"M+\"; break; case Calculator.CalculatorButtonType.MC: content = \"MC\"; break; case Calculator.CalculatorButtonType.MR: content = \"MR\"; break; case Calculator.CalculatorButtonType.MS: content = \"MS\"; break; case Calculator.CalculatorButtonType.MSub: content = \"M-\"; break; case Calculator.CalculatorButtonType.Multiply: content = \"*\"; break; case Calculator.CalculatorButtonType.Nine: content = \"9\"; break; case Calculator.CalculatorButtonType.None: break; case Calculator.CalculatorButtonType.One: content = \"1\"; break; case Calculator.CalculatorButtonType.Percent: content = \"%\"; break; case Calculator.CalculatorButtonType.Seven: content = \"7\"; break; case Calculator.CalculatorButtonType.Negate: content = \"+/-\"; break; case Calculator.CalculatorButtonType.Six: content = \"6\"; break; case Calculator.CalculatorButtonType.Sqrt: content = \"Sqrt\"; break; case Calculator.CalculatorButtonType.Subtract: content = \"-\"; break; case Calculator.CalculatorButtonType.Three: content = \"3\"; break; case Calculator.CalculatorButtonType.Two: content = \"2\"; break; case Calculator.CalculatorButtonType.Zero: content = \"0\"; break; } return content; } public static bool IsDigit(Calculator.CalculatorButtonType buttonType) { switch (buttonType) { case Calculator.CalculatorButtonType.Zero: case Calculator.CalculatorButtonType.One: case Calculator.CalculatorButtonType.Two: case Calculator.CalculatorButtonType.Three: case Calculator.CalculatorButtonType.Four: case Calculator.CalculatorButtonType.Five: case Calculator.CalculatorButtonType.Six: case Calculator.CalculatorButtonType.Seven: case Calculator.CalculatorButtonType.Eight: case Calculator.CalculatorButtonType.Nine: case Calculator.CalculatorButtonType.Decimal: return true; default: return false; } } public static bool IsMemory(Calculator.CalculatorButtonType buttonType) { switch (buttonType) { case Calculator.CalculatorButtonType.MAdd: case Calculator.CalculatorButtonType.MC: case Calculator.CalculatorButtonType.MR: case Calculator.CalculatorButtonType.MS: case Calculator.CalculatorButtonType.MSub: return true; default: return false; } } public static decimal ParseDecimal(string text) { return Decimal.Parse(text, CultureInfo.CurrentCulture); } public static decimal Add(decimal firstNumber, decimal secondNumber) { return firstNumber + secondNumber; } public static decimal Subtract(decimal firstNumber, decimal secondNumber) { return firstNumber - secondNumber; } public static decimal Multiply(decimal firstNumber, decimal secondNumber) { return firstNumber * secondNumber; } public static decimal Divide(decimal firstNumber, decimal secondNumber) { return firstNumber / secondNumber; } public static decimal Percent(decimal firstNumber, decimal secondNumber) { return firstNumber * secondNumber / 100M; } public static decimal SquareRoot(decimal operand) { return Convert.ToDecimal(Math.Sqrt(Convert.ToDouble(operand))); } public static decimal Fraction(decimal operand) { return 1 / operand; } public static decimal Negate(decimal operand) { return operand * -1M; } } }