 using System; 
using System.Collections.Generic; 
using System.ComponentModel;
using System.Data;
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
namespace Calculator
{ 
public partial class Form1:Form
{ 
public Form1() 
{ 
InitializeComponent();
} 
int maxSize = 0;
double total1 = 0; 
double total2 = 0; 
bool equalBtnClicked = false;
bool periodBtnClicked = false; 
bool addBtnClicked = false; 
bool subtractBtnClicked = false; 
bool multiplyBtnClicked = false; 
bool divideBtnClicked = false; 
private void Exit()
{ 
if (MessageBox.Show("Do you want to Exit ?", "Exit", MessageBoxButtons.YesNo, 
MessageBoxIcon.Question) == DialogResult.Yes)
{ 
Application.Exit();
} 
} 
private void PrintNumber(Button btnName)
{ 
if (maxSize < 19)
{
if (label2.Text == "0" || equalBtnClicked == true)
{ 
label2.Text = btnName.Text;
} 
else if (label2.Text == "0.")
{ 
label2.Text += btnName.Text;
} 
else
{ 
label2.Text += btnName.Text;
} 
equalBtnClicked = false;
++maxSize;
} 
} 
private void ClearScreen()
{ 
label2.Text = "0";
maxSize = 0;
ResetButtons();
} 
private void ResetButtons()
{ 
equalBtnClicked = false;
periodBtnClicked = false; 
addBtnClicked = false;
subtractBtnClicked = false;
multiplyBtnClicked = false;
divideBtnClicked = false; 
} 
private void Operator()
{ 
total1 += double.Parse(label2.Text); 
ClearScreen();
ResetButtons();
} 
private void Period()
{ 
if (maxSize < 19)
{ 
if (label2.Text == "0" || equalBtnClicked == true)
{
label2.Text = "0.";
equalBtnClicked = false;
} 
else
{ 
if (periodBtnClicked == false)
{ 
label2.Text += ".";
} 
periodBtnClicked = true;
++maxSize;
} 
} 
} 
private void Zero()
{ 
if (label2.Text == "0" || equalBtnClicked == true)
{ 
label2.Text = btnZero.Text;
maxSize = 0;
} 
else
{ 
label2.Text = label2.Text + btnZero.Text; 
++maxSize;
} 
} 
private void Add()
{ 
Operator();
addBtnClicked = true;
} 
private void Subtract()
{ 
Operator();
subtractBtnClicked = true;
} 
private void Multiply()
{ 
Operator();
multiplyBtnClicked = true;
}
private void Divide()
{ 
Operator();
divideBtnClicked = true;
} 
private void Equals()
{ 
if (!((addBtnClicked == false) && (subtractBtnClicked == false) && (multiplyBtnClicked 
== false) && (divideBtnClicked == false)))
{ 
if (addBtnClicked == true)
{ 
total2 = total1 + double.Parse(label2.Text);
} 
else if (subtractBtnClicked == true)
{ 
total2 = total1 - double.Parse(label2.Text); 
} 
else if (multiplyBtnClicked == true)
{ 
total2 = total1 * double.Parse(label2.Text);
} 
else if (divideBtnClicked == true)
{ 
total2 = total1 / double.Parse(label2.Text);
} 
label2.Text = total2.ToString();
total1 = 0; 
} 
ResetButtons();
equalBtnClicked = true; 
maxSize = 0;
} 
private void btnZero_Click(object sender, EventArgs e) 
{ 
Zero();
} 
private void btnOne_Click(object sender, EventArgs e) 
{ 
PrintNumber(One);
} 
private void btnTwo_Click(object sender, EventArgs e) 
{ 
PrintNumber(Two);
} 
private void btnThree_Click(object sender, EventArgs e) 
{ 
PrintNumber(Three);
} 
private void btnFour_Click(object sender, EventArgs e) 
{ 
PrintNumber(Four);
} 
private void btnFive_Click(object sender, EventArgs e) 
{ 
PrintNumber(Five);
} 
private void btnSix_Click(object sender, EventArgs e) 
{ 
PrintNumber(Six);
} 
private void btnSeven_Click(object sender, EventArgs e) 
{ 
PrintNumber(Seven); 
} 
private void btnEight_Click(object sender, EventArgs e) 
{ 
PrintNumber(Eight);
} 
private void btnNine_Click(object sender, EventArgs e) 
{ 
PrintNumber(Nine);
} 
private void btnClear_Click(object sender, EventArgs e) 
{ 
ClearScreen();
}
private void btnPeriod_Click(object sender, EventArgs e) 
{ 
Period();
} 
private void btnAdd_Click(object sender, EventArgs e) 
{ 
Add(); 
} 
private void btnEquals_Click(object sender, EventArgs e)
{ 
Equals(); 
} 
private void btnSubtract_Click(object sender, EventArgs e) 
{ 
Subtract();
} 
private void btnDivide_Click(object sender, EventArgs e) 
{ 
Divide();
} 
private void btnMultiply_Click(object sender, EventArgs e) 
{ 
Multiply();
} 
private void btnExit_Click(object sender, EventArgs e) 
{ 
Exit();
} 
private void Clear_Click(object sender, EventArgs e) 
{ 
} 
} 
}

created 3 years 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
}