calc project

[Siten0308]

Hello,

I am finally getting down OOP in C#, i just need assistance with one thing on my calculator project (hopefully its just one thing), I have the textbox, which object is called txtbox1, the button part is my big hurdle right now, so far i thought of

private void btn2_Click(object sender, EventArgs e)
        {
            num.numbering = 2;
            txtbox1.Text = "2";
        }

But i know its wrong because it is passing it as a string, i would need to pass it as a double, how do i do that, i say this is wrong because when i press the button... only 2 comes up, but if i press it again only 2 comes up, and it does not turn it into 22. Hope this makes sense, also if you can give me a tip/hint or advice on how to do the equation part to since i am a little lost on that. my class is called numbers, which i declared the class to be num if you are wondering.

[Jordan]

It sounds like you only need to concatenate the string:

private void btn2_Click(object sender, EventArgs e)
        {
            num.numbering = 2;
            txtbox1.Text += "2";
        }

More: How to: Concatenate Multiple Strings (C# Programming Guide)

[Siten0308]

Thanks jordan,

that took care of the problem, i will also look into that link that you attached.

[Siten0308]

My last question of course would happen to do with the equation part of the calculator, I am a little lost, if anyone can give me an example,tip, hint etc for that it would be great.

[Jordan]

What do you mean? And can you post what code you have already?

[Siten0308]

Sorry for the confusion, so the main thing as I said, i am making a calculator that will help me with my OOP, now what i have made successfully so far is a class called numbers which is below and a form, which has all the number buttons in place which is below the numbers class, what i am thinking that might work is make another class called equations, which I will make methods for + - * /, then... thats all i go so far : ) i am hoping some one can give me the rest what I am missing that can help me out and plus this would go good in the tutorial section. I hope this explains better as well as the class equation is a good idea?

namespace WindowsFormsApplication1
{
    class numbers
    {
        private double number;
        private double number2;
        
        public double numbering
        {
            get { return number; }
            set { number = value; }
        }
        public double numbering2
        {
            get { return number2; }
            set { number2 = value; }
        }
    }
}

So here is the form program

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;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        numbers num = new numbers();

        public Form1()
        {
            InitializeComponent();
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnclear_Click(object sender, EventArgs e)
        {
            num.numbering = 0;
           
        }

        private void txtbox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void btn1_Click(object sender, EventArgs e)
        {
            try
            {
                num.numbering = 1;
                txtbox1.Text += "1";
            }

            catch(Exception)
            {
                MessageBox.Show("WHAT DID YOU DO!!");
            }
        }

        private void btn2_Click(object sender, EventArgs e)
        {
            num.numbering = 2;
            txtbox1.Text += "2";
        }

        private void btn3_Click(object sender, EventArgs e)
        {
            num.numbering = 3;
            txtbox1.Text += "3";
        }

        private void btn4_Click(object sender, EventArgs e)
        {
            num.numbering = 4;
            txtbox1.Text += "4";

        }

        private void btn5_Click(object sender, EventArgs e)
        {
            num.numbering = 5;
            txtbox1.Text += "5";
        }

        private void btn6_Click(object sender, EventArgs e)
        {
            num.numbering = 6;
            txtbox1.Text += "6";
        }

        private void btn7_Click(object sender, EventArgs e)
        {
            num.numbering = 7;
            txtbox1.Text += "7";
        }

        private void btn8_Click(object sender, EventArgs e)
        {
            num.numbering = 8;
            txtbox1.Text += "8";
        }

        private void btn9_Click(object sender, EventArgs e)
        {
            num.numbering = 9;
            txtbox1.Text += "9";
        }

        private void btn0_Click(object sender, EventArgs e)
        {
            num.numbering = 0;
            txtbox1.Text += "0";
        }

[Siten0308]

my bad.... did the code thing wrong : (

[TcM]

Code Tags fixed.
I still don't understand your problem.

[Siten0308]

I guess my hurdle i am trying to get over, making a calculator like windows pretty much, using only 1 text box, when a user clicks on button, 1, and shows up number 1 in text box, but getting it to click on a equation and then a number is a mystery to me, like how do they collect data provided by 1 text box? I have the code so far from what i got but i know i am doing something wrong, i hope this helps the confusion.

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;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        numbers num = new numbers();

        public Form1()
        {
            InitializeComponent();
        }
        enum operation
        {
            add,
            subtract,
            divide,
            multiply
        }


        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnclear_Click(object sender, EventArgs e)
        {
            num.numbering = 0;
           
        }

        private void txtbox1_TextChanged(object sender, EventArgs e)
        {

        }

        private bool firstNumberSet = false;
        private void btn1_Click(object sender, EventArgs e)
        {
            
            try
            {
                if (!firstNumberSet)
                {
                    num.numbering = 1;
                }
                else
                {
                    num.numbering2 = 2;
                }
                txtbox1.Text += "1";
            }

            catch(Exception)
            {
                MessageBox.Show("WHAT DID YOU DO!!");
            }
        }

        private void btn2_Click(object sender, EventArgs e)
        {
            num.numbering = 2;
            txtbox1.Text += "2";
        }

        private void btn3_Click(object sender, EventArgs e)
        {
            num.numbering = 3;
            txtbox1.Text += "3";
        }

        private void btn4_Click(object sender, EventArgs e)
        {
            num.numbering = 4;
            txtbox1.Text += "4";

        }

        private void btn5_Click(object sender, EventArgs e)
        {
            num.numbering = 5;
            txtbox1.Text += "5";
        }

        private void btn6_Click(object sender, EventArgs e)
        {
            num.numbering = 6;
            txtbox1.Text += "6";
        }

        private void btn7_Click(object sender, EventArgs e)
        {
            num.numbering = 7;
            txtbox1.Text += "7";
        }

        private void btn8_Click(object sender, EventArgs e)
        {
            num.numbering = 8;
            txtbox1.Text += "8";
        }

        private void btn9_Click(object sender, EventArgs e)
        {
            num.numbering = 9;
            txtbox1.Text += "9";
        }

        private void btn0_Click(object sender, EventArgs e)
        {
            num.numbering = 0;
            txtbox1.Text += "0";
        }

        operation currentOperation;
        operation currentOperationminus;
        operation currentOperationmult;
        operation currentOperationdiv;
        private void btnplus_Click(object sender, EventArgs e)
        {
            currentOperation = operation.add;
            firstNumberSet = true;                    // this is where we decide that the first number is done and we should
                                                      //start on the second one
        }

        private void btnsubtract_Click(object sender, EventArgs e)
        {
            currentOperationminus = operation.subtract;
            firstNumberSet = true;
        }

        private void btnmultiply_Click(object sender, EventArgs e)
        {
            currentOperationmult = operation.multiply;
            firstNumberSet = true;
        }

        private void btndivide_Click(object sender, EventArgs e)
        {
            currentOperationmult = operation.divide;
            firstNumberSet = true;
        }

        private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            aboutfrm bout = new aboutfrm();
            bout.Show();
        }

        private void btnequal_Click(object sender, EventArgs e)
        {
            numbers num = new numbers();
            Equations equat = new Equations();
                 
            switch (currentOperation) 
            { 
                case operation.add:
                    equat.add(num.numbering, num.numbering2);
                    break;
                case operation.subtract:
                    equat.subtract(num.numbering, num.numbering2);
                    break;
                case operation.multiply:
                    equat.mulitply(num.numbering, num.numbering2);
                    break;
                case operation.divide:
                    equat.divide(num.numbering, num.numbering2);
                    break;
            }
             
        }
    }
}

and here is my two classes which first class is numbers:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
    class numbers
    {
        private double number;
        private double number2;
        
        public double numbering
        {
            get { return number; }
            set
            {
                number = number * 10;   // this will move the other digits left one
                number += value;        // this puts the new one in the ones column
            }
        }

        public double numbering2
        {
            get { return number2; }
            set
            {
                number2 = number2 * 10;   // this will move the other digits left one
                number2 += value;        // this puts the new one in the ones column
            }
        }
    }
}

second class equations:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
    class Equations
    {
        public double add(double num1, double num2)
        {
            return num1 + num2;
        }
        public double subtract(double num1, double num2)
        {
            return num1 - num2;
        }
        public double mulitply(double num1, double num2)
        {
            return num1 * num2;
        }
        public double divide(double num1, double num2)
        {
            return num1 / num2;
        }
    }
}

[TcM]

So what you want is let's say the user presses 1, in the textbox 1 is displayed, then the user presses + and then presses 2, in the textbox 2 is displayed, and you want the answer (3) to be displayed in the textbox when the user presses =?

In that case you need a temp variable to store the 1st number and then make it + with the second number.