C# 사용 개념 대충 순서 대충보는거 대충

///////////////////////////////// 콘솔 //////////////////////////////////////

using System;

using System.Collections.Generic;

using System.Text;

using Calculator;  // 추가~~~

namespace ConsoleApplication37

{

class Program

{

static void Main(string[] args)

{

int i = int.Parse(Console.ReadLine());

int j = int.Parse(Console.ReadLine());

Cal c1 = new Cal();

int k = c1.Add(i,j);

int o = c1.Minus(i,j);

}

}

}

///////////////////////////////// 윈도우 //////////////////////////////////////

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace WindowsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

int i= Convert.ToInt32(textBox1.Text);

int j=Convert.ToInt32(textBox2.Text);

Calculator.Cal c1 = new Calculator.Cal();

int tot = c1.Add(i,j);

textBox3.Text =  Convert.ToString(tot);

}

private void button2_Click(object sender, EventArgs e)

{

int i= Convert.ToInt32(textBox1.Text);

int j= Convert.ToInt32(textBox2.Text);

Calculator.Cal c1 = new Calculator.Cal();

int tot = c1.Minus(i,j);

textBox3.Text = Convert.ToString(tot);

}

}

}

///////////////////////////////// 웹 //////////////////////////////////////

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using Calculator;

public partial class _Default : System.Web.UI.Page 

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

protected void Button1_Click(object sender, EventArgs e)

{

Cal c1 = new Cal();

int i = Convert.ToInt32(TextBox1.Text);

int j = Convert.ToInt32(TextBox2.Text);

int tot = c1.Add(i,j);

int sum = c1.Minus(i, j);

TextBox3.Text = Convert.ToString(tot);

TextBox4.Text = Convert.ToString(sum);

}

}