I have shown how you can perform math as well as logical  operations together.
 
 So first we will create a new windows application and design the below form.
 
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 Now use the below code,
 
- using System;    
- using System.Collections.Generic;    
- using System.ComponentModel;    
- using System.Data;    
- using System.Drawing;    
- using System.Linq;    
- using System.Text;    
- using System.Threading.Tasks;    
- using System.Windows.Forms;    
-     
- namespace Example_of_math_variables_and_if_statements    
- {    
-     public partial class Form1 : Form    
-     {    
-         private string x;   
-         private string y;    
-         private string random_string;    
-         private int x_number;   
-         private int y_number;    
-         private int random;    
-         public Form1()    
-         {    
-             InitializeComponent();   
-         }    
-         private void radioButton1_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")   
-             {    
-                 x = "0";   
-             }    
-             if (y == "")   
-             {    
-                 y = "0";   
-             }    
-             x_number = Convert.ToInt32(x);   
-             y_number = Convert.ToInt32(y);    
-             random = x_number + y_number;   
-             random_string = Convert.ToString(random);   
-             this.label3.Text = random_string;    
-         }   
-         private void radioButton2_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             random = x_number - y_number;    
-             random_string = Convert.ToString(random);    
-             this.label3.Text = random_string;    
-         }    
-         private void radioButton4_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = " 0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             random = x_number * y_number;    
-             random_string = Convert.ToString(random);    
-             this.label3.Text = random_string;    
-         }    
-         private void radioButton3_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             if (y_number == 0)   
-             {    
-                 random_string = "Divide by zero error";    
-             }    
-             else    
-             {    
-                 random = x_number / y_number;    
-                 random_string = Convert.ToString(random);    
-             }    
-             this.label3.Text = random_string;    
-         }    
-         private void radioButton7_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             if (x_number == y_number)   
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.yes;     
-             }    
-             else   
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.no;    
-             }    
-         }    
-         private void radioButton8_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             if (x_number > y_number)   
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.yes;    
-             }    
-             else    
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.no;    
-             }    
-         }    
-         private void radioButton6_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             if (x_number < y_number)   
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.yes;    
-             }    
-             else    
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.no;    
-             }    
-         }    
-         private void radioButton5_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             if (x_number >= y_number)   
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.yes;    
-             }    
-             else    
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.no;    
-             }    
-         }    
-         private void radioButton9_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             if (x_number <= y_number)   
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.yes;    
-             }    
-             else    
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.no;    
-             }    
-         }    
-         private void radioButton10_CheckedChanged(object sender, EventArgs e)    
-         {    
-             x = this.textBox1.Text;    
-             y = this.textBox2.Text;    
-             if (x == "")    
-             {    
-                 x = "0";    
-             }    
-             if (y == "")    
-             {    
-                 y = "0";    
-             }    
-             x_number = Convert.ToInt32(x);    
-             y_number = Convert.ToInt32(y);    
-             if (x_number != y_number)   
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.yes;    
-             }    
-             else    
-             {    
-                 this.pictureBox1.Image = global::Example_of_math_variables_and_if_statements.Properties.Resources.no;    
-             }    
-         }    
-     }    
- }    
 
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