Lao Chen and the small stone

Namespace small stone and Lao Chen {public partial class Form1:form {public Form1 () {Initializecompo        Nent (); } public static int Count = 0;//The total number of topics public static int right = 0;//Correct topic total number public static int connt =        0;//error problem number int j = 0;        String A;        String B;        int C; private void Label3_click (object sender, EventArgs e) {TB4.        Text = "+"; The private void Label4_click (object sender, EventArgs e) {TB4.        Text = "-"; The private void Label5_click (object sender, EventArgs e) {TB4.        Text = "*"; The 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 = = "")//Do not remember the total number of questions when the problem is not imported; {MessageBox.Show ("cannot be empty");            count--;                } else if (TextBox3.Text = = c.tostring ()) {right++; MessageBox.Show ("Answer right!")            ");                } else if (textbox3.text! = c.tostring ()) {connt++; MessageBox.Show ("Answer the wrong!")            ");      } 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) {//Save parent's math problem StreamWriter WR            = File.appendtext ("G1.txt"); Url WriteLine (tb1.            Text); Url            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//prevents the exception from occurring when the problem is done directly to the Form2 form,,,       {         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 ("Denominator cannot be zero");//Determine if the denominator is zero,                    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 ();      }    }   } 

define a Class1 class

Namespace small stone and Lao Chen
{
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 consumption

Lao Chen and the small stone