C#, WinForms ] 계산기 구현

 

 

STATE에 따라 버튼 이벤트가 다르게 동작해야 하기 때문에 어떻게 할까 고민하다 아래 4가지로 정의해서 구현해봄

 

IDLE

COMPLETE_FIRST_NUMBER

OPERATOR_INSERTED

COMPLETE_SECONDE_NUMBER

 

 

 

 

 

 

지금 C#문법 배우는 중이고 일단 돌아가는거 보자 하고 막 만들어서 컨트롤 이름도 안바꿈..

 

namespace cal
{
    public partial class Form1 : Form
    {

        enum state_t
        {
            IDLE,
            COMPLETE_FIRST_NUMBER,
            OPERATOR_INSERTED,
            COMPLETE_SECOND_NUMBER
        }

        state_t currentState = state_t.COMPLETE_FIRST_NUMBER;

        public Form1()
        {
            InitializeComponent();
            this.label1.AutoSize = false;

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {

            if (currentState == state_t.COMPLETE_FIRST_NUMBER)
            {
                this.label1.Text += "0";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "0";
                currentState = state_t.COMPLETE_SECOND_NUMBER;

            }
            else if(currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "0";
            }
            else
            {
                this.label2.Text = "";
                this.label3.Text = "";
            }

        }

        private void button5_Click(object sender, EventArgs e)
        {
            if(currentState == state_t.IDLE)
            {
                this.label1.Text = "1";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "1";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "1";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }

        }

        private void button6_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "2";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "2";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "2";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button7_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "3";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "3";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "3";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button12_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "4";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "4";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "4";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button11_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "5";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "5";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "5";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button10_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "6";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "6";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "6";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button13_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "7";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "7";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "7";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button14_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "8";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "8";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "8";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button15_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.IDLE)
            {
                this.label1.Text = "9";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_FIRST_NUMBER;
            }
            else if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text += "9";

            }
            else if (currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "9";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else
            {

            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.label1.Text = "0";
            this.label2.Text = "";
            this.label3.Text = "";
            currentState = state_t.IDLE;
        }


        private void button1_Click(object sender, EventArgs e)
        {
            if(currentState == state_t.IDLE)
            {
                this.label1.Text = "0.";
                this.label2.Text = "";
                this.label3.Text = "";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else if(currentState == state_t.OPERATOR_INSERTED)
            {
                this.label1.Text = "0.";
                currentState = state_t.COMPLETE_SECOND_NUMBER;
            }
            else if(currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                if (!this.label1.Text.Contains("."))
                {
                    this.label1.Text += ".";
                }
            }
            else
            {

            }



        }

        private void label1_TextChanged(object sender, EventArgs e)
        {
            if(this.label1.Text.EndsWith("."))
            {
                string numStr = this.label1.Text.Replace(",", "").Replace(".", "");

                if (decimal.TryParse(numStr, out decimal num))
                {
                    string formattedStr = string.Format("{0:#,##0}", num);

                    this.label1.Text = formattedStr + ".";
                }
            }
            else if (this.label1.Text.Contains('.'))
            {
                string numStr = this.label1.Text.Replace(",", "");

                string[] delimeter = { "." };

                string[] parts = numStr.Split(delimeter, 2, StringSplitOptions.RemoveEmptyEntries);

                if (decimal.TryParse(parts[0], out decimal num))
                {
                    string formattedStr = string.Format("{0:#,##0}", num);

                    this.label1.Text = formattedStr + "." + parts[1];
                }
            }
            else
            {
                string numStr = this.label1.Text.Replace(",", "");

                if(decimal.TryParse(numStr, out decimal num))
                {
                    string formattedStr = string.Format("{0:#,##0}", num);

                    this.label1.Text = formattedStr;
                }
            }

            Graphics g = this.label1.CreateGraphics();

            SizeF textSize = g.MeasureString(this.label1.Text, this.label1.Font);

            if(this.label1.Width < textSize.Width)
            {
                this.label1.Text = this.label1.Text.Substring(0, this.label1.Text.Length - 1);
            }

        }

        private void button8_Click(object sender, EventArgs e)
        {
            if(currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.OPERATOR_INSERTED || currentState == state_t.IDLE)
            {
                this.label2.Text = "+";
                this.label3.Text = this.label1.Text;
                currentState = state_t.OPERATOR_INSERTED;
            }
            else if(currentState == state_t.COMPLETE_SECOND_NUMBER )
            {
                double first;
                double second;
                double result = 0;

                double.TryParse(this.label1.Text, out second);
                double.TryParse(this.label3.Text, out first);

                result = first + second;

                if (Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }

                this.label3.Text = this.label1.Text;
                this.label2.Text = "+";

                currentState = state_t.OPERATOR_INSERTED;
            }
            else
            {

            }
        }

        private void button9_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.OPERATOR_INSERTED || currentState == state_t.IDLE)
            {
                this.label2.Text = "-";
                this.label3.Text = this.label1.Text;
                currentState = state_t.OPERATOR_INSERTED;
            }
            else if (currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                double first;
                double second;
                double result = 0;

                double.TryParse(this.label1.Text, out second);
                double.TryParse(this.label3.Text, out first);

                result = first - second;                     

                if (Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }

                this.label3.Text = this.label1.Text;
                this.label2.Text = "-";

                currentState = state_t.OPERATOR_INSERTED;

            }
            else
            {

            }
        }

        private void button16_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.OPERATOR_INSERTED || currentState == state_t.IDLE)
            {
                this.label2.Text = "×";
                this.label3.Text = this.label1.Text;
                currentState = state_t.OPERATOR_INSERTED;
            }
            else if (currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                decimal first;
                decimal second;
                decimal result = 0;

                decimal.TryParse(this.label1.Text, out second);
                decimal.TryParse(this.label3.Text, out first);

                result = first * second;

                if (Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }

                this.label3.Text = this.label1.Text;
                this.label2.Text = "×";

                currentState = state_t.OPERATOR_INSERTED;
            }
            else
            {

            }

        }

        private void button17_Click(object sender, EventArgs e)
        {
            if (currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.OPERATOR_INSERTED || currentState == state_t.IDLE)
            {
                this.label2.Text = "÷";
                this.label3.Text = this.label1.Text;
                currentState = state_t.OPERATOR_INSERTED;
            }
            else if (currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                decimal first;
                decimal second;
                decimal result = 0;

                decimal.TryParse(this.label1.Text, out second);
                decimal.TryParse(this.label3.Text, out first);

                result = first / second;

                if (Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }

                this.label3.Text = this.label1.Text;
                this.label2.Text = "÷";

                currentState = state_t.OPERATOR_INSERTED;
            }
            else
            {

            }

        }

        private void button4_Click(object sender, EventArgs e)
        {

            decimal first;
            decimal second;
            decimal result = 0;

            decimal.TryParse(this.label1.Text, out second);
            decimal.TryParse(this.label3.Text, out first);

            if (this.label2.Text == "+")
            {
                this.label3.Text = this.label3.Text + " + " + this.label1.Text;
                this.label2.Text = "=";

                result = first + second;
                if(Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }
                
            }
            else if (this.label2.Text == "-")
            {
                this.label3.Text = this.label3.Text + " - " + this.label1.Text;
                this.label2.Text = "=";

                result = first - second;
                if (Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }
            }
            else if (this.label2.Text == "×")
            {
                this.label3.Text = this.label3.Text + " × " + this.label1.Text;
                this.label2.Text = "=";

                result = first * second;
                if (Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }
            }
            else if (this.label2.Text == "÷")
            {
                this.label3.Text = this.label3.Text + " ÷ " + this.label1.Text;
                this.label2.Text = "=";

                result = first / second;
                if (Math.Floor(result) == result)
                {
                    this.label1.Text = string.Format("{0:#,##0}", result);
                }
                else
                {
                    this.label1.Text = string.Format("{0:#,##0.########################}", result);
                }
            }
            else
            {
                this.label2.Text = "=";
                this.label3.Text = this.label1.Text;
            }

            currentState = state_t.IDLE;
        }

        private void button18_Click(object sender, EventArgs e)
        {
            if(currentState == state_t.COMPLETE_FIRST_NUMBER || currentState == state_t.COMPLETE_SECOND_NUMBER)
            {
                this.label1.Text = this.label1.Text.Substring(0, this.label1.Text.Length - 1);
                if(this.label1.Text == "")
                {
                    this.label1.Text = "0";
                }
            }
        }
    }
}