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hi... this is my first attempt at building an application in microsoft visual studio 2010 working on the .net framework 4 and C#.

here is a utility calculator implementing basic calculator functions.

step 1: create a new project and select windows forms application.

step 2: right click the form name icon in the solution explorer window(located on right top corner by default... or add the window from the view) and add a new form. name it calci (a calci.cs form will open)

step 3:drag and drop the text box and the buttons from the toolbox to the form and click on them to execute the button functions.

step 4: in the calci.cs form add the following default namespace directives

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

step 5: start by writing the basic button definitions in the calci.cs form page.

the code :

// initialize the form attributes by the following constructor.

public partial class calci : Form

{

int lenex1=0,j = 0,m=0,o=0,p=0,q=0;

string op1;

decimal exans, ex1 = 0;

char ope='\0';

public calci()

{

InitializeComponent();

}

//double click the buttons on the design view screen and add the following code to the button functions.

private void btn1_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn1.Text;

}

private void btn2_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn2.Text;

}

private void btn3_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn3.Text ;

}

private void btn4_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn4.Text;

}

private void btn5_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn5.Text;

}

private void btn6_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn6.Text;

}

private void btn7_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn7.Text;

}

private void btn8_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn8.Text;

}

private void btn9_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn9.Text;

}

private void btn0_Click(object sender, EventArgs e)

{

txtboxinput.Text+= btn0.Text;

}

the calci.cs[design] page appears as follows:

step 6: now add more buttons to the form to execute the various functions of a claculator.

i have used the basic functions like

addition , subtraction , multiplication , division .

step 7: writing the code for the calculator functions as well as the clear button , ON button and decimal button :

private void btnpt_Click(object sender, EventArgs e) //decimal button def.

{

if (j == 0)

{

txtboxinput.Text += btnpt.Text;

j = 1;

}

}

private void btnclear_Click(object sender, EventArgs e) //clear button def.

{

txtboxinput.Text = " "; //restores all buttons back to their initial state

lenex1 = 0;

j = 0;

m = 0;

o = 0;

p = 0;

q = 0;

ex1 = 0;

ope = '\0';

}

private void btnplus_Click(object sender, EventArgs e) //plus button def.

{

if (m == 0)

{

int i = 0, len = txtboxinput.Text.Length;

j = 0;

ope = '+';

op1 = txtboxinput.Text.Substring(i);

ex1 = Convert.ToDecimal(op1);

lenex1 = txtboxinput.Text.Length;

txtboxinput.Text += btnplus.Text;

//Pass(lenex1);

m =o=p=q= 1;

}

}

private void btnminus_Click(object sender, EventArgs e) //minus button def.

{

if (o == 0)

{

int i = 0, len = txtboxinput.Text.Length;

j = 0;

ope = '-';

op1 = txtboxinput.Text.Substring(i);

ex1 = Convert.ToDecimal(op1);

lenex1 = txtboxinput.Text.Length;

txtboxinput.Text += btnminus.Text;

//Pass(lenex1);

m = o = p = q = 1;

}

}

private void btnmultiply_Click(object sender, EventArgs e) //multiply button def.

{

if (p == 0)

{

int i = 0, len = txtboxinput.Text.Length;

j = 0;

ope = '*';

op1 = txtboxinput.Text.Substring(i);

ex1 = Convert.ToDecimal(op1);

lenex1 = txtboxinput.Text.Length;

txtboxinput.Text += btnmultiply.Text;

//Pass(lenex1);

m = o = p = q = 1;

}

}

private void btndivide_Click(object sender, EventArgs e) // divide button def.

{

if (q == 0)

{

int i = 0, len = txtboxinput.Text.Length;

j = 0;

ope = '/';

op1 = txtboxinput.Text.Substring(i);

ex1 = Convert.ToDecimal(op1);

lenex1 = txtboxinput.Text.Length;

txtboxinput.Text += btndivide.Text;

//Pass(lenex1);

m = o = p = q = 1;

}

}

private void btnequal_Click(object sender, EventArgs e) //equal button def.

{

int ans = 0;

decimal final;

int l = txtboxinput.Text.Length;

string dec;

// txtboxinput.Text = Convert.ToString( ope);

//txtboxinput.Text = "hell";

try

{

ans = lenex1 + 1;

dec = txtboxinput.Text.Substring(ans);

final = val2(Convert.ToDecimal(dec));

txtboxinput.Text = Convert.ToString(final);

j = m = o = p = q = 0;

}

catch (Exception ex)

{

txtboxinput.Text = "0";

throw ex;

}

}

decimal val2(decimal ex2) //calculation function

{

//txtboxinput.Text = "switch";

switch (ope) //switch case executing the functions using operands ex1 and ex2

{

case '+':exans = ex1 + ex2;

break;

case '-':exans = ex1-ex2;

break;

case '*': exans = ex1 * ex2;

break;

case '/' : if (ex2 != 0)

{

exans = ex1 / ex2;

}

else

{

exans = 0;

}

break;

}

return exans;

}

private void btnON_Click(object sender, EventArgs e) // on button def.

{

txtboxinput.Enabled = true; //all the controls have been disabled and

//are enabled at the click of ON button

btn1.Enabled = true;

btn2.Enabled = true;

btn3.Enabled = true;

btn4.Enabled = true;

btn5.Enabled = true;

btn6.Enabled = true;

btn7.Enabled = true;

btn8.Enabled = true;

btn9.Enabled = true;

btn0.Enabled = true;

btnplus.Enabled = true;

btnminus.Enabled = true;

btnmultiply.Enabled = true;

btndivide.Enabled = true;

btnpt.Enabled = true;

btnequal.Enabled = true;

btnclear.Enabled = true;

lenex1 = 0;

j = 0;

m = 0;

o = 0;

p = 0;

q = 0;

ex1 = 0;

ope = '\0';

}

now the calci.cs[design] looks like :

tip : to add the background image open the calci.cs[design] and add the properties window by selecting from "VIEW". in the properties window locate the backgroundimage property . browse and add the desired image. It appears as follows:

thanks for reading...

any doubts or suggestions are welcome.

for feedback you can comment on this blog

mail me at: akrita.ag@gmail.com

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