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How to create an application to solve an expression

Simond Gear 2054 27 Nov 2016

Hi Buddy

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

Thanks

Ask by Simond Gear

Updated 28 Nov 2016

1 Answers

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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