老陈和小石头

namespace 小石头和老陈
{
     
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static int Count = 0;//题目总数
        public static int right = 0;//正确的题目总数
        public static int connt = 0;//错误题目数
        int j = 0;
        string  a;
        string  b;
        int  c;

        private void label3_Click(object sender, EventArgs e)
        {
            tb4.Text = "+";
        }

        private void label4_Click(object sender, EventArgs e)
        {
            tb4.Text = "-";
        }

        private void label5_Click(object sender, EventArgs e)
        {
            tb4.Text = "*";
        }
        private void label6_Click(object sender, EventArgs e)
        {
            tb4.Text = "/";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            a = textBox6.Text;
            b = textBox8.Text;
            string str = textBox7.Text;
            switch (str)
            {
                case "+":

                    Class1 j = new Class1();
                    j.ji(a, b, out c);
                    break;
                case "-":
                    Class1 j2 = new Class1();
                    j2.ji2(a, b, out c);
                    break;
                case "*":
                    Class1 j3 = new Class1();
                    j3.ji3(a, b, out c);
                    break;
                case "/":
                    Class1 j4 = new Class1();
                    j4.ji4(a, b, out c);
                    break;
            }
            if (textBox8.Text == "" || textBox6.Text == "")//当没有导入题时不能记到总做的题数；
            {
                MessageBox.Show("不能为空");
                Count--;

            }
            else if (textBox3.Text == c.ToString())
            {
                right++;
                MessageBox.Show("回答正确！");
            }
            else if (textBox3.Text != c.ToString())
            {

                connt++;
                MessageBox.Show("回答错误！");
            }

            Count++;

            textBox6.Clear();
            textBox7.Clear();
            textBox8.Clear();
            textBox3.Clear();
            textBox1.Text = Count.ToString();
            
        }
           
        private void button2_Click(object sender, EventArgs e)
        {
               Form2 form = new Form2();
                form.ShowDialog();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //保存家长出的数学题
            StreamWriter wr = File.AppendText("g1.txt");
            wr.WriteLine(tb1.Text );
            wr.Close();
            StreamWriter wr1 = File.AppendText("g2.txt");
            wr1.WriteLine(tb2.Text);
            wr1.Close();
            StreamWriter wr2 = File.AppendText("g3.txt");
            wr2.WriteLine(tb4.Text);
            wr2.Close();
            tb1.Clear();
            tb2.Clear();
            tb4.Clear();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            try//防止出现异常，当题做完直接跳转到Form2窗体，，，，
            {
                j++;
                string[] jg = new string[100];
                jg = File.ReadAllLines("g1.txt");
                textBox6.Text = jg[j];
                string[] jg2 = new string[100];
                jg2 = File.ReadAllLines("g3.txt");
                textBox7.Text = jg2[j];
                string[] jg3 = new string[100];
                jg3 = File.ReadAllLines("g2.txt");
                textBox8.Text = jg3[j];
                if (jg2[j] =="/"&& jg3 [j]=="0")
                {
                    MessageBox.Show("分母不能为零");//判断分母是否为零，
                    j++;
                    textBox6.Clear();
                    textBox7.Clear();
                    textBox8.Clear();
                }
            }
            catch
            {
                Form2 form = new Form2();
                form.ShowDialog();
            }
        }

        private void button5_Click(object sender, EventArgs e)
        {
            Form3 form3 = new Form3();
            form3.ShowDialog();
        }
    }       
  }

定义一个Class1类

namespace 小石头和老陈
{
    class Class1
    {
        public void ji(string x, string y, out int s)
        {
            s = int.Parse(x) + int.Parse(y);
        }
        public void ji2(string x, string y, out int s)
        {
            s = int.Parse(x) - int.Parse(y);
        }
        public void ji3(string x, string y, out int s)
        {
            s = int.Parse(x) * int.Parse(y);
        }
        public void ji4(string x, string y, out int s)
        {
            s = int.Parse(x) / int.Parse(y);
        }
    }
}
   

PSP消耗