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How to create an application to solve an expression

Simond Gear 1906 27-Nov-2016
Hi Buddy

Please help me how to create an application to solve an expression.

Thanks
c# c# 
Updated on 28-Nov-2016
Simond Gear

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1 Answers

Abhishek Srivasatava

Abhishek Srivasatava

28-Nov-2016

Hi Simond,

I have generated the code to solve the expression which is written in the textbox.  Please review it and let us know if any information is required.


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
WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private object
CalculateExpression(string eqn)
        {
            string test = eqn.Replace("{", "(").Replace("}", ")").Replace("[", "(").Replace("]", ")");
            string test2 = test.Replace(")", ")*").Replace("(", "*(");
            string test3 = test2.Replace("**", "*");
            char[] ch = new char[100];
            ch = test3.ToCharArray();
            int a = test3.Length;
            a = a - 1;
            if (ch[a] == '*')
            {
                ch[a] = ' ';
            }
            if (ch[0] == '*')
            {
                ch[0] = ' ';
            }
            string test4 = new string(ch);
 
            string test5 = test4.Replace("/*", "/").Replace("*/", "/").Replace("+*", "+").Replace("*+", "+").Replace("-*", "-").Replace("*-", "*").Replace("(*", "(").Replace("*)", ")").Replace("**", "*");
            eqn = test5.Trim();
 
            DataTable dt = new DataTable();
            var result = dt.Compute(eqn, string.Empty);
            return result;
        }
 
 
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
 
                string result = Convert.ToString(CalculateExpression(textBox1.Text.Trim()));
                textBox2.Text = result;
                textBox2.ForeColor =
Color.Blue;
            }
            catch (Exception ex)
            {
                textBox2.Text = "Please
Review your Expression" + ex.Message.ToString();
                textBox2.ForeColor = Color.Red;
            }
        }
    }
}

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