C# Simple Calculator Help Please

[lpiazza]

I am to do a simple calculator in C# windows forum. This is my first time doing C# and I've scoured what I could to figure this out. I'm not looking to copy and paste, I want to understand what I'm doing. My biggest issue at this moment is figuring out how to have the calculator solve a line of numbers. My calculator you can hit the buttons to enter numbers and the expression or whatever, but I can only figure out how to do it with two numbers. Any Ideas?

[lpiazza]

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 Piazza_Simple_Calculator
{
    public partial class Form1 : Form
    {
        string input = string.Empty;
        string math1 = string.Empty;
        string math2 = string.Empty;
        char operation;
        double result = 0.0;
        public Form1()
        {
            InitializeComponent();
        } 

        private void Equal_Click(object sender, EventArgs e)
        {
            math2 = input;
            double num1, num2;
            double.TryParse(math1, out num1);
            double.TryParse(math2, out num2);
            if(operation=='+')
            {
                result = num1 + num2;
                Screen.Text = result.ToString();
            }
            else if (operation == '-')
            {
                result = num1 - num2;
                Screen.Text = result.ToString();
            }
            else if (operation == '*')
            {
                result = num1 * num2;
                Screen.Text = result.ToString();
            }
            else if (operation == '/')
            {
                if(num2!=0)
                {
                    result = num1 / num2;
                    Screen.Text = result.ToString();
                }
                else
                {
                    Screen.Text = "You Cannot Divide By 0!";
                }
            }
        }

        private void B0_Click(object sender, EventArgs e)
        {
            this.Screen.Text = "";
            input += "0";
            this.Screen.Text += input;
            Lbl_eq.Text += input;
        }

        private void B1_Click(object sender, EventArgs e)
        {
            this.Screen.Text = "";
            input += "1";
            this.Screen.Text += input;
            Lbl_eq.Text += input;
        }
        private void button7_Click(object sender, EventArgs e)
        {
            this.Screen.Text = "";
            input += "2";
            this.Screen.Text += input;
            Lbl_eq.Text += input;
        }
        private void B3_Click(object sender, EventArgs e)
        {
            input += "3";
            Screen.Text = "3";
            Lbl_eq.Text = Lbl_eq.Text + "3";
        }

        private void B4_Click(object sender, EventArgs e)
        {
            input += "4";
            Screen.Text = "4";
            Lbl_eq.Text = Lbl_eq.Text + "4";
        }

        private void B5_Click(object sender, EventArgs e)
        {
            input += "5";
            Screen.Text = "5";
            Lbl_eq.Text = Lbl_eq.Text + "5";
        }

        private void B6_Click(object sender, EventArgs e)
        {
            input += "6";
            Screen.Text = "6";
            Lbl_eq.Text = Lbl_eq.Text + "6";
        }

        private void B7_Click(object sender, EventArgs e)
        {
            input += "7";
            Screen.Text = "7";
            Lbl_eq.Text = Lbl_eq.Text + "7";
        }

        private void B8_Click(object sender, EventArgs e)
        {
            input += "8";
            Screen.Text = "8";
            Lbl_eq.Text =Lbl_eq.Text+"8";
        }

        private void B9_Click(object sender, EventArgs e)
        {
            input += "9";
            Screen.Text = "9";
            Lbl_eq.Text = Lbl_eq.Text + "9";
        }
        private void Clear_Click(object sender, EventArgs e)
        {
            Screen.Text = "";
            Lbl_eq.Text = "";
        }
         private void Back_Click(object sender, EventArgs e)
        {
            int length = Screen.TextLength - 1;
            string text = Screen.Text;
            Screen.Clear();
            for(int i=0; i<length;i++)
            {
                Screen.Text=Screen.Text + text[i];
            }
        }
        private void Dec_Click(object sender, EventArgs e)
        {
            input += ".";
            Screen.Text = Screen.Text + ".";
        }
        private void Add_Click(object sender, EventArgs e)
        {
            math1 = input;
            operation = '+';
            Screen.Text ="" + "+";
            Lbl_eq.Text = Lbl_eq.Text + "+";
            input = string.Empty;
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void Sub_Click(object sender, EventArgs e)
        {
            math1 = input;
            operation = '-';
            Screen.Text = "-";
            Lbl_eq.Text = Lbl_eq.Text + "-";
            input = string.Empty;
        }

        private void Mult_Click(object sender, EventArgs e)
        {
            math1 = input;
            operation = '*';
            Screen.Text = "*";
            Lbl_eq.Text = Lbl_eq.Text + "*";
            input = string.Empty;
        }

        private void Div_Click(object sender, EventArgs e)
        {
            math1 = input;
            operation = '/';
            Screen.Text = "/";
            Lbl_eq.Text = Lbl_eq.Text + "/";
            input = string.Empty;
        }
    }
}

Yea I know half of the code doesn't work right, I've been stuck for a bit and it's hard to find things.

Edited January 31, 2022 by lpiazza