 using System;
using System.Data;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;

namespace Calculator.Utils
{
	public static class Utils
	{
		// This method evaluates a mathematical expression represented as a string
		// and returns the result as an integer.
		private static int executeExpression(string text)
		{
			string number = new DataTable().Compute(text, "").ToString();
			double numberDouble = Convert.ToDouble(number);

			return Convert.ToInt16(numberDouble);
		}

		// This method checks if the given character is a numeric digit.
		private static bool isNumeric(char character)
		{
			return int.TryParse(character.ToString(), out _);
		}

		// This method handles button clicks for numeric input and updates the primary display.
		// It enforces limits on the number of digits that can be displayed.
		public static void handleClick(string number)
		{
			TextBlock primaryDisplay = MainPage.mainPage.primaryDisplay;
			TextBlock secondaryDisplay = MainPage.mainPage.secondaryDisplay;
			TextBlock errorDisplay = MainPage.mainPage.errorDisplay;

			// Ensure the number cannot have more than 6 digits
			if (primaryDisplay.Text.Length < 6)
			{
				if (!(primaryDisplay.Text.Length == 0 && number == "0"))
				{
					if (secondaryDisplay.Text.Length + primaryDisplay.Text.Length <= 50)
					{
						primaryDisplay.Text += number;
					}
					else
					{
						errorDisplay.Text = "The expression can have up to 50 digits";
						FlyoutBase.ShowAttachedFlyout(primaryDisplay);
					}
				}
			}
			else
			{
				errorDisplay.Text = "The number can have up to 6 digits";
				FlyoutBase.ShowAttachedFlyout(primaryDisplay);
			}
		}

		// This method handles button clicks for arithmetic operation input and updates the displays accordingly.
		// It combines the primary and secondary displays to form a complete expression.
		public static void handleOperationClick(string operation)
		{
			TextBlock primaryDisplay = MainPage.mainPage.primaryDisplay;
			TextBlock secondaryDisplay = MainPage.mainPage.secondaryDisplay;

			if (primaryDisplay.Text.Length + secondaryDisplay.Text.Length < 50)
			{
				if (secondaryDisplay.Text.Length != 0)
				{
					if (!isNumeric(secondaryDisplay.Text[secondaryDisplay.Text.Length - 1]) && primaryDisplay.Text.Length == 0)
						secondaryDisplay.Text = secondaryDisplay.Text.Substring(0, secondaryDisplay.Text.Length - 1) + operation;
					else
						secondaryDisplay.Text += primaryDisplay.Text + operation;
				}
				else if (primaryDisplay.Text.Length != 0)
				{
					secondaryDisplay.Text += primaryDisplay.Text + operation;
				}

				primaryDisplay.Text = "";
			}
		}

		// This method handles the button click to clear the displays.
		public static void handleClearButtonClick()
		{
			MainPage.mainPage.primaryDisplay.Text = "";
			MainPage.mainPage.secondaryDisplay.Text = "";
		}

		// This method handles the button click to calculate and display the result of the expression.
		public static void handleEqualButtonClick()
		{
			TextBlock primaryDisplay = MainPage.mainPage.primaryDisplay;
			TextBlock secondaryDisplay = MainPage.mainPage.secondaryDisplay;
			TextBlock errorDisplay = MainPage.mainPage.errorDisplay;

			try
			{
				primaryDisplay.Text = executeExpression(primaryDisplay.Text + secondaryDisplay.Text).ToString();

				if (primaryDisplay.Text.Length > 6)
					primaryDisplay.FontSize = 48;
				secondaryDisplay.Text = "";
			}
			catch
			{
				errorDisplay.Text = "There's an error in the expression.";
				FlyoutBase.ShowAttachedFlyout(primaryDisplay);
			}
		}

		// This method handles the button click to delete the last digit entered.
		public static void handleBackspace()
		{
			TextBlock primaryDisplay = MainPage.mainPage.primaryDisplay;

			if (primaryDisplay.Text.Length > 0)
				primaryDisplay.Text = primaryDisplay.Text.Substring(0, primaryDisplay.Text.Length - 1);
		}
	}
}

created 1 year ago

C Sharp Online Compiler

Write, Run & Share C# code online using OneCompiler's C# online compiler for free. It's one of the robust, feature-rich online compilers for C# language, running on the latest version 8.0. Getting started with the OneCompiler's C# compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C# and start coding.

Read inputs from stdin

OneCompiler's C# online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

using System;
 
namespace Sample
{
  class Test
    {
      public static void Main(string[] args)
       {
         string name;
         name = Console.ReadLine();
         Console.WriteLine("Hello {0} ", name);
	}
     }
}

About C Sharp

C# is a general purpose object-oriented programming language by Microsoft. Though initially it was developed as part of .net but later it was approved by ECMA and ISO standards.

You can use C# to create variety of applications, like web, windows, mobile, console applications and much more using Visual studio.

Syntax help

Data types

Data Type	Description	Range	size
int	To store integers	-2,147,483,648 to 2,147,483,647	4 bytes
double	to store large floating point numbers with decimals	can store 15 decimal digits	8 bytes
float	to store floating point numbers with decimals	can store upto 7 decimal digits	4 bytes
char	to store single characters	-	2 bytes
string	to stores text	-	2 bytes per character
bool	to stores either true or false	-	1 bit

Variables

Syntax

datatype variable-name = value;

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition or set of few conditions IF-ELSE is used.

if(conditional-expression) {
   // code
} 
else {
   // code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement) {
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

data-type[] array-name;

Methods

Method is a set of statements which gets executed only when they are called. Call the method name in the main function to execute the method.

Syntax

static void method-name() 
{
  // code to be executed
}