#代码
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 WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
float num1 = 0;
float num2 = 0;
float result = 0;
num1 = float.Parse(textBox1.Text); //将文本框输入的字符转换成数值
num2 = float.Parse(textBox2.Text);
result = num1 * num2;
textBox3.Text = result.ToString(); //将数值转换成字符
}
private void button2_Click(object sender, EventArgs e)
{
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
}
}
}
#效果
