Question

C#从左边列表框中选择一个乘数，在中间列表框中选择一个被乘数，这时在右边的列表框中出现他们的求积算式

Answer 1

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 whr
{
public partial class Form1 : Form
{
int a = 0, b = 0;
public Form1()
{
InitializeComponent();
} private void Form1_Load(object sender, EventArgs e)
{
listBox1.Items.Add("11");
listBox1.Items.Add("21");
listBox1.Items.Add("32");
listBox1.Items.Add("43");
listBox1.Items.Add("51");
listBox1.Items.Add("63");
listBox1.Items.Add("75");
listBox1.Items.Add("80");
listBox1.Items.Add("93");
listBox1.Items.Add("10");
listBox2.Items.Add("12");
listBox2.Items.Add("24");
listBox2.Items.Add("37");
listBox2.Items.Add("46");
listBox2.Items.Add("58");
listBox2.Items.Add("65");
listBox2.Items.Add("72");
listBox2.Items.Add("83");
listBox2.Items.Add("91");
listBox2.Items.Add("20");

} private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
a = int.Parse(listBox1.Text);
}
private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
{
b = int.Parse(listBox2.Text);
listBox3.Items.Add(string.Format("{0}×{1}={2}", a, b, a * b));
} private void listBox3_SelectedIndexChanged(object sender, EventArgs e)
{
if (listBox3.SelectedIndex >= 0)
listBox3.Items.RemoveAt(listBox3.SelectedIndex);
}
}
}