using System;

public class Program

{ static decimal pi = 3.14159M; 

    public static void Main()

    {

        start:

        Console.WriteLine("if you want to find out the volume of a cone, type x.");

        Console.WriteLine("if you want to find out the surface area of a cone, type x1"); 

        Console.WriteLine("if you want to find out the volume of a cylinder, type y.");

        Console.WriteLine("if you want to find out the surface area of a cylinger, type y1"); 

        Console.WriteLine("if you want to find out the volume of a sphere, type z.");

        Console.WriteLine("if you want to find out the surface of a sphere, type z1"); 

        string ans = Console.ReadLine(); 

        if (ans == "x")

        { Console.WriteLine("What is the area of the base?"); 

         decimal bse = decimal.Parse(Console.ReadLine()); 

         Console.WriteLine("What is height?"); 

         decimal height = decimal.Parse(Console.ReadLine()); 

         decimal output1 = cne(bse, height); 

         Console.WriteLine("The volume of a cone with a base area of "+bse+" and a height of "+height+" is "+output1.ToString("##.##"));

         Console.WriteLine("Want to try again? Type v to continue or anything else to quit.");

         string option = Console.ReadLine(); 

         while (option =="v")

         {

         Console.Clear(); 

             goto start;}}

        if (ans == "x1") 

        {Console.WriteLine("What is the radius of the cone?");

        decimal rad = decimal.Parse(Console.ReadLine()); 

        Console.WriteLine("What is the height?"); 

        decimal he = decimal.Parse(Console.ReadLine()); 

        decimal ouput12 = conesa(rad,he);

        Console.WriteLine("The surface area of a cone with a radius of "+rad+" and a height of "+he+" is "+ output12.ToString("##.##")); 

        Console.WriteLine("Want to try again? Type v to continue or anything else to quit.");

         string option = Console.ReadLine(); 

         while (option =="v")

         {

         Console.Clear(); 

             goto start;}

         if (rad<=0)

         {Console.WriteLine("Make sure to enter a positive value. Please press enter"); 

         Console.Clear(); 

         goto start;} 

        }

        if(ans =="y")

        { Console.WriteLine("What is the area of the base?"); 

         decimal bse2 = decimal.Parse(Console.ReadLine()); 

         Console.WriteLine("What is height?"); 

         decimal height2 = decimal.Parse(Console.ReadLine()); 

         decimal output2 = cyl(bse2, height2); 

         Console.WriteLine("The volume of a cylinder with a base area of "+bse2+" and a height of "+height2+" is "+output2.ToString("##.##"));

         Console.WriteLine("Want to try again? Type v to continue or anything else to quit.");

         string option = Console.ReadLine(); 

         while (option =="v")

         {

         Console.Clear(); 

             goto start;}

        if (bse2<=0||height2<=0)

        {Console.WriteLine("Make sure to enter a positive value. Please press enter."); 

        Console.Clear(); 

        goto start; }

        }

        if(ans == "y1")

        {Console.WriteLine("What is the radius?"); 

        decimal r2 = decimal.Parse(Console.ReadLine()); 

        Console.WriteLine("What is the height?"); 

        decimal h2 = decimal.Parse(Console.ReadLine()); 

        decimal ouput13 = cylsa(r2, h2); 

        Console.WriteLine(output13.ToString("##.##")); 

         Console.WriteLine("Want to try again? Type v to continue or anything else to quit.");

         string option = Console.ReadLine(); 

         while (option =="v")

         {

         Console.Clear(); 

             goto start;}

        if (r2<=0 || h2<=0)

        {Console.WriteLine("Make sure to enter a positive value. Please press enter."); 

        Console.Clear(); 

        goto start; }

        }

        if(ans =="z")

        { Console.WriteLine("What is the radius?"); 

         decimal rad1 = decimal.Parse(Console.ReadLine()); 

         decimal output3 = sph(rad1); 

         Console.WriteLine("The volume of a sphere with a radius of " + rad1+ " is " + output3.ToString("##.##"));

         Console.WriteLine("Want to try again? Type v to continue or anything else to quit.");

         string option = Console.ReadLine(); 

         while (option =="v")

         {

         Console.Clear(); 

        goto start;}

        if(rad1<=0)

        {Console.WriteLine("Please enter a positive value. Please press enter.");

        Console.Clear(); 

        goto start; }

        }

        if (ans == "z1")

        {Console.WriteLine("What is the radius?");

        decimal r4 = decimal.Parse(Console.ReadLine());

        decimal output14 = sphsa(r4); 

        Console.WriteLine(output14.ToString(Console.ReadLine())); 

        if (r4<=0)

        {Console.WriteLine("Please enter a positive value. Please press enter. "); 

        Console.Clear(); 

        goto start; } }

}

​

    static private decimal cne(decimal b,decimal h)

    {decimal conev=1/3M*b*h;

     return (conev); 

    }

    static private decimal conesa(decimal r12, decimal h12)

     {{

      decimal s = r12*h12*h12; 

      decimal a = r12*r12*pi; 

      decimal conesa1 = s*a; 

     return (conesa1); }}

    static private decimal cyl(decimal b2, decimal h2)

    {decimal cylv=b2*h2; 

     return (cylv); }

    static private decimal cylsa(decimal r3,decimal h3)

    {decimal rh = 2*r3*h3*pi; 

     decimal ph = 2*pi*r3; 

     decimal phrh= rh+ph; 

     return (phrh);}

    static private decimal sph (decimal rad1)

    {

    decimal sphv = pi*rad1;

    return (sphv); }

    static private decimal sphsa(decimal rd)

    {decimal spsa = 4*pi*rd; 

    return (spsa); }  

}