using System;

public class Program

{

    public static void Main()

    {

    string e;

    const string co = "************ SIMPLE CALCULATOR ********************";    

    Console.WriteLine(co);

    Console.WriteLine();    

    const string yn = "would you like further instruction ? type in yes or no ";

    Console.WriteLine(yn);  

    Console.WriteLine();

    e=Console.ReadLine();

    if(e== "yes")

    {

    const string co1 = "INSTRUCTIONS:";

    Console.WriteLine(co1);

    Console.WriteLine();

    const string co2 = "A) FOR INCREMENTS: ";

    Console.WriteLine(co2);

    const string co3 = " for a prefix increment for the first input please type '++X' in the operator.";

    Console.WriteLine(co3);

    const string co4 = " for a postfix increment for the first input please type 'X++' in the operator.";

    Console.WriteLine(co4); 

    const string co5 = " for the prefix increment for the second input please type in '++Y' in the operator.";  

    Console.WriteLine(co5); 

    const string co6 = "for postfix increment on the second input please type in 'Y++' in the operator.";

    Console.WriteLine(co6); 

    Console.WriteLine();    

    const string co7 = "B) FOR DECREMENTS: ";

    Console.WriteLine(co7);

    const string co8= " for the prefix decrement for the first input please type '--X' in operators.";

    Console.WriteLine(co8);

    const string co9 = "for the postfix decrement for the first input please type 'X--' in operators.";

    Console.WriteLine(co9); 

    const string co10= " for the prefix decrement for the second input please type '--Y' in operators.";    

    Console.WriteLine(co10);

    const string co11 = "for the postfix decrement for the second input please type 'Y--' in operators.";   

    Console.WriteLine(co11);    

    Console.WriteLine();

    }

    else if (e== "no")

    {

        Console.WriteLine("instruction will no longer be shown");   

        Console.WriteLine();

    }

        string in1;

        string in2;

        string in3;

       int x;

       int y;

        int z;

    Console.WriteLine("enter first input: ");

    in1=Console.ReadLine();

    Console.WriteLine("enter operator: ");

    in3=Console.ReadLine(); 

    Console.WriteLine("enter second input: ");

    in2=Console.ReadLine();

   x=Convert.ToByte(in1);

   y=Convert.ToByte(in2);

    if (in3 == "+") 

    {

         z = x+y;

        Console.WriteLine("the sum is : " + z);

    }

   else if (in3 == "-")

    {

        z = x-y;

        Console.WriteLine("the difference is : " + z);

    }

    else if (in3 == "/")

    {

        z = x/y;

        Console.WriteLine("the quotient is : " + z);

    }

    else if (in3=="*")

    {

        z = x*y;

        Console.WriteLine("the product is : " + z);

    }

    else if (in3 == "++X")

    {

        z = ++x;

        Console.WriteLine("the prefix increment of X : " + z);

    }

    else if (in3== "X++")

    {

        z = x++;

        Console.WriteLine("the postfix increment of X : " + z);

    }

    else if (in3=="Y++")

    {

        z = y++;

        Console.WriteLine("the postfix increment of Y : " + z);

    }

    else if (in3=="++Y")

    {

        z = ++y;

        Console.WriteLine("the prefix increment of Y : " + z);

    }

    else if (in3=="X--")

    {

        z = x--;

        Console.WriteLine("the postfix decrement of X: " + z);

    }

    else if (in3 == "--X")

    {

        z = --x;

        Console.WriteLine("the prefix decrement of X: " + z);

    }

    else if (in3 == "Y--")

    {

        z = y--;

        Console.WriteLine("the postfix decrement of Y: " + z);

    }

    else if (in3 == "--Y")

    {

        z = --y;

        Console.WriteLine("the prefix decrement of Y : " + z);

    }

}

}