Introduction: Hello everybody, in this article i will explain that how we can solve any mathamatic equation using BODMAS rule using asp.net. This is very helpful artucle for the asp.net deveploer.

Implementation: Create a page named bodmas_rule.aspx page in your root folder. download NCalc - Binaries file from the above below link

http://ncalc.codeplex.com/releases/view/69050

create a bin folder in the root of your directory and place the NCalc.dll file. Place a label from the toolbox and set its id as lbl_msg. below I am giving code for .aspx page as well as .aspx.cs page . copy this code and paste it into your website and enjoy your code.

Code for .aspx page:

<div>

<br />

<asp:Label ID="lbl_check_answer" runat="server" Text="" Visible="false"></asp:Label>

<asp:Button ID="btn_addition" runat="server" onclick="btn_addition_Click"

Text="Addition" CausesValidation="False" />

<br />

<asp:Label ID="lbl_msg" runat="server" Visible="false"></asp:Label>

<asp:Label ID="lblRandomEquation" runat="server" Text=""></asp:Label>

<%--<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"

ControlToValidate="txt_answer" ErrorMessage="Enter only numbers"

ValidationExpression="[-+]?[0-9]+"></asp:RegularExpressionValidator>--%>

<br />

<asp:Button ID="Button1" runat="server" Text="Click" onclick="Button1_Click" />

<asp:Button ID="btn_next_question" runat="server"

onclick="btn_next_question_Click" Text="See next Question" Visible="False"

CausesValidation="False" />

<br />

<asp:Label ID="lbl_answe" runat="server" Visible="False"></asp:Label>

</div>

Code for aspx.cs page:

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.Data.SqlClient;

using System.Text;

public partial class bodmas_latest : System.Web.UI.Page

{

SqlCommand cmd;

SqlConnection con = new SqlConnection();

protected void Page_Load(object sender, EventArgs e)

{

// here i am creationg the connection

con.ConnectionString = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;

con.Open();

if (con.State == ConnectionState.Closed)

{ con.Open(); }

con.Close();

if (Page.IsPostBack == false)

{

}

protected void btn_addition_Click(object sender, EventArgs e)

{

// in the session starting_time m storing the starting time when the question is generated

Session["starting_time"] = "";

Session["starting_time"] = DateTime.Now;

Insert_user();

method_bodmas(Convert.ToInt32(lbl_msg.Text));

// Create a page named bodmas_rule.aspx in the root of your folder

//http://ncalc.codeplex.com/releases/view/69050

// download NCalc - Binaries file from the above below link

// create a bin folder in the root of your directory and place the NCalc.dll file

// inside the bin folder. after placing the NCalc.dll file NCalc.Expression in the

// help

// here i am giving the equation which will solved by the BODMAS rule

// inside the object e1

//NCalc.Expression e1 = new NCalc.Expression("(13*3)+(39*2)-7");

//NCalc.Expression e1 = new NCalc.Expression("(15*10)-17+23*(9-3)");

NCalc.Expression e1 = new NCalc.Expression(lblRandomEquation.Text);

ViewState["correct_answer"] = (e1.Evaluate().ToString());

ViewState["question"] = lblRandomEquation.Text;

lbl_check_answer.Text = ViewState["correct_answer"].ToString();

btn_next_question.Visible = false;

txt_answer.Enabled = true;

lbl_answe.Text = "";

}

protected void Button1_Click(object sender, EventArgs e)

{

if (txt_answer.Text == "")

{

lbl_answe.Visible = true;

lbl_answe.Text = "Type Your Answer Please";

}

else

{

// here m compairing the the answer entered by the user and

// the correct answer. if the both answer r same

// then it goes inside the if

// otherwise it will go inside the else

// and both answer will stored inside the table

// if wrong or if correct

if (Convert.ToInt32(ViewState["correct_answer"]) == Convert.ToInt32(txt_answer.Text))

{

if (con.State == ConnectionState.Closed)

{ con.Open(); }

cmd = new SqlCommand();

cmd.CommandText = @"INSERT INTO tb_bodmas

VALUES(@question,@correct_answer,

@your_answer,@username,@starting_time,

@ending_time)";

cmd.Connection = con;

cmd.Parameters.AddWithValue("@question", ViewState["question"].ToString());

cmd.Parameters.AddWithValue("@correct_answer", Convert.ToInt32(ViewState["correct_answer"]));

cmd.Parameters.AddWithValue("@your_answer", txt_answer.Text);

cmd.Parameters.AddWithValue("@username", string.Empty);

cmd.Parameters.AddWithValue("@starting_time", Convert.ToDateTime(Session["starting_time"]));

cmd.Parameters.AddWithValue("@ending_time", DateTime.Now);

cmd.ExecuteNonQuery();

cmd.Dispose();

con.Close();

lbl_answe.Visible = true;

lbl_answe.Text = "correct";

btn_next_question.Visible = true;

txt_answer.Text = "";

txt_answer.Enabled = false;

}

else

{

if (con.State == ConnectionState.Closed)

{ con.Open(); }

cmd = new SqlCommand();

cmd.CommandText = @"INSERT INTO tb_bodmas

VALUES(@question,@correct_answer,

@your_answer,@username,@starting_time,@ending_time)";

cmd.Connection = con;

cmd.Parameters.AddWithValue("@question", ViewState["question"].ToString());

cmd.Parameters.AddWithValue("@correct_answer", Convert.ToInt32(ViewState["correct_answer"]));

cmd.Parameters.AddWithValue("@your_answer", txt_answer.Text);

cmd.Parameters.AddWithValue("@username", string.Empty);

cmd.Parameters.AddWithValue("@starting_time", Convert.ToDateTime(Session["starting_time"]));

cmd.Parameters.AddWithValue("@ending_time", DateTime.Now);

cmd.ExecuteNonQuery();

cmd.Dispose();

con.Close();

lbl_answe.Visible = true;

lbl_answe.Text = "Incorrect";

txt_answer.Text = "";

Session["starting_time"] = string.Empty;

Session["starting_time"] = DateTime.Now;

}

protected void btn_next_question_Click(object sender, EventArgs e)

{

// in the session starting_time m storing the starting time when the question is generated

Session["starting_time"] = "";

Session["starting_time"] = DateTime.Now;

Insert_user();

method_bodmas(Convert.ToInt32(lbl_msg.Text));

//NCalc.Expression e1 = new NCalc.Expression("(15*10)-17+23*(9-3)");

//in The next i am passing the equation to the e1 object then

// this equation will be solve by the method.

NCalc.Expression e1 = new NCalc.Expression(lblRandomEquation.Text);

// here m storing the correct answer vin the viewstate because when user enter their answer

// then i'll compare this answer to the viewstate's value

// if these values are equal then lbl_answe.Text shows the answer is correct and

// if not then it shows the answer is incorrect

ViewState["correct_answer"] = (e1.Evaluate().ToString());

ViewState["question"] = lblRandomEquation.Text;

lbl_check_answer.Text = ViewState["correct_answer"].ToString();

btn_next_question.Visible = false;

txt_answer.Enabled = true;

lbl_answe.Text = "";

}

public void method_bodmas(int n)

{

// this function will generate the equation for the Bodmas

//i am passing int n value from the lbl_mgs.text inseide the Insert_use function

StringBuilder equationBuilder = new StringBuilder();

Random rnd = new Random();

char[] operators = new char[] { '+', '-', '*', '/' };

bool isBraces = rnd.Next(0, 2) == 1 ? true : false;

bool isBracesOpened = false;

int rndBracesLocation = rnd.Next(0, n - 1);

int[] nums = new int[n];

for (int i = 0; i < n; i++)

{

nums[i] = rnd.Next(1, 9);

}

char[] appOperator = new char[n - 1];

for (int j = 0; j < n - 1; j++)

{

appOperator[j] = operators[rnd.Next(0, 3)];

}

for (int i = 0; i < n - 1; i++)

{

if ((isBraces && i == rndBracesLocation) || (isBracesOpened))

{

if (isBracesOpened)

{

equationBuilder.Append(nums[i]);

equationBuilder.Append(")");

equationBuilder.Append(appOperator[i]);

isBracesOpened = false;

}

else

{

equationBuilder.Append("(");

equationBuilder.Append(nums[i]);

equationBuilder.Append(appOperator[i]);

isBracesOpened = true;

}

isBraces = false;

}

else

{

equationBuilder.Append(nums[i]);

equationBuilder.Append(appOperator[i]);

}

equationBuilder.Append(nums[n - 1]);

string equ = equationBuilder.ToString();

if (equ.Contains("(") && !equ.Contains(")"))

equ += ")";

lblRandomEquation.Text = equ;

}

// This function will generate the value from 4 to 5

// this function will decides that how many digits will come

// inside the BODMAS equation

public String recieptno(string rec)

{

int i = 0;

int j = 0;

int r = 0;

Random ran = null;

string str = null;

str = "";

ran = new Random();

i = ran.Next(1, 1);

for (j = 1; j <= i; j++)

{

r = ran.Next(4, 9);

if (r < 65)

{

}

str = str + r;

}

string recc = str;

return recc;

}

private void Insert_user()

{

// the generated value will store inside the UID and after this lbl_msg

string rec1 = "";

string UID = recieptno(rec1);

lbl_msg.Text = UID;

//value wil be returned here

}

Conclusion

Through this article, you have learned how to solve any equation using BODMAS rule. If you have any suggestion to improve this article then send mail me at bharti222000@yahoo.com.

Thanks

Using ASP.NET

Friday 15 July 2011

BODMAS rule using asp.net

Introduction: Hello everybody, in this article i will explain that how we can solve any mathamatic equation using BODMAS rule using asp.net. This is very helpful artucle for the asp.net deveploer.

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