using System.Collections.G
eneric;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
double ans;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
double n1 = Double.Parse(textBox1.Text);
double n2 = Double.Parse(textBox2.Text);
ans = n1 + n2;
label1.Text = "= " + (n1 + n2).ToString();
}
private void button2_Click(object sender, EventArgs e)
{
double n1 = Double.Parse(textBox1.Text);
double n2 = Double.Parse(textBox2.Text);
label1.Text = "= " + (n1 - n2).ToString();
}
private void button4_Click(object sender, EventArgs e)
{
double n1 = Double.Parse(textBox1.Text);
double n2 = Double.Parse(textBox2.Text);
if (n2 == 0)
{
MessageBox.Show("除數不可以為0");
label1.Text = "= ";
return;
}
label1.Text = "= " + (n1 / n2).ToString();
}
private void button3_Click(object sender, EventArgs e)
{
double n1 = Double.Parse(textBox1.Text);
double n2 = Double.Parse(textBox2.Text);
label1.Text = "= " + (n1 * n2).ToString();
}
}
}