[C#]组合框设计windows加减乘除简单计算器应用

组合框使用方法，按照下面图片上提示，设计一个windows应用程序，实现不同运算。

界面设计：

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.Windows.Forms;

namespace combox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            label1.Text = "=";
            button1.Text = "选择不同运算符进行计算";
            comboBox1.Items.Add("+");
            comboBox1.Items.Add("-");
            comboBox1.Items.Add("*");
            comboBox1.Items.Add("/");
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            float a, b, c;
            a = Convert.ToSingle(textBox1.Text);
            b = Convert.ToSingle(textBox2.Text);
            if (comboBox1.Text== "+")
            {
                c = a + b;
                textBox3.Text = c.ToString(); 
            }
            else if (comboBox1.Text == "-")
            {
                c = a - b;
                textBox3.Text = c.ToString() ;
            }
            else if (comboBox1.Text == "*")
            {
                c = a * b;
                textBox3.Text = c.ToString();

            }
            else
            {
                c = a / b;
                textBox3.Text = c.ToString();
            }
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }
    }
}

运行：

[C#]组合框设计windows加减乘除简单计算器应用,布布扣,bubuko.com