C# 学习之旅（3） --- 会说话的简易计算器

 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;
 using System.Speech;
 using System.Speech.Synthesis;

 namespace calculator
 {
     public partial class Form1 : Form
     {
         SpeechSynthesizer sp = new SpeechSynthesizer();

         public Form1()
         {
             InitializeComponent();
         }

         private void Add_Click(object sender, EventArgs e)
         {
             Compute compute = new Compute();
             compute.set(number1, number2);
             answer.Text = string.Format("{0}",compute.add());
             sp.SpeakAsync(answer.Text);
         }

         private void Subtract_Click(object sender, EventArgs e)
         {
             Compute compute = new Compute();
             compute.set(number1, number2);
             answer.Text = string.Format("{0}",compute.subtract());
             sp.SpeakAsync(answer.Text);
         }

         private void Multiply_Click(object sender, EventArgs e)
         {
             Compute compute = new Compute();
             compute.set(number1, number2);
             answer.Text = string.Format("{0}", compute.multiply());
             sp.SpeakAsync(answer.Text);
         }

         private void Divide_Click(object sender, EventArgs e)
         {
             Compute compute = new Compute();
             compute.set(number1, number2);
             answer.Text = string.Format("{0}", compute.divide());
             sp.SpeakAsync(answer.Text);
         }

         private void Power_Click(object sender, EventArgs e)
         {
             Compute compute = new Compute();
             compute.set(number1, number2);
             answer.Text = string.Format("{0}", compute.power());
             sp.SpeakAsync(answer.Text);
         }

         private void number1_TextChanged(object sender, EventArgs e)
         {
             string str = number1.Text.Trim();

             for (int i = ; i < str.Length; i++)
             {
                 if (!Char.IsNumber(str[i]))
                 {
                     number1.Text = string.Empty;
                     number1.BackColor = Color.Red;
                 }
                 else
                 {
                     number1.BackColor = Color.Empty;
                 }
             }
         }

         private void number2_TextChanged(object sender, EventArgs e)
         {
             string str = number2.Text.Trim();
             for (int i = ; i < str.Length; i++)
             {
                 if (!Char.IsNumber(str[i]))
                 {
                     number2.Text = string.Empty;
                     number2.BackColor = Color.Red;
                 }
                 else
                 {
                     number2.BackColor = Color.Empty;
                 }
             }
         }

     }

     class Compute {
         private double a;
         private double b;
         private double x;

         public void set(object a, object b)
         {
             TextBox tempa = (TextBox)a;
             TextBox tempb = (TextBox)b;
             this.a = double.Parse(tempa.Text);
             this.b = double.Parse(tempb.Text);
         }

         public double add()
         {
             this.x = this.a + this.b;
             return this.x;
         }

         public double subtract()
         {
             this.x = this.a - this.b;
             return this.x;
         }

         public double multiply()
         {
             this.x = this.a * this.b;
             return this.x;
         }

         public double divide()
         {
             this.x = this.a / this.b;
             return this.x;
         }

         public double power()
         {
             this.x = Math.Pow(this.a, this.b);
             return this.x;
         }
     }
 }

看到这里您辛苦了，谢谢 : )

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