C# Programming Buzz: Make a c# program that calculate 1st Year/2nd Year/Intermediate Combine % Persentage by taking all subjects num as input

INPUT:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace mARKS_CALCUlTOR

{

class Program

{

static void Main(string[] args)

{

double phyI, chemI, mathI, islI, engI, urdI, obtnum, persentage, avgmarks, obtnumI, persentageI, avgmarksI, phyII, chemII, mathII, islII, engII, urdII, obtnumII, persentageII, avgmarksII;

Console.WriteLine("Please inter your intermediate marks");

char op;

Console.WriteLine("if you want to calculate your 1st year marks press 1 or \nif you want to calculate your 2ndyear marks please press 2 or \nif you want to calculate your 1st year and 2nd year combine marks press 3");

op = Convert.ToChar(Console.ReadLine());

if (op == '1')

{

Console.WriteLine("Please enter your 1st year marks");

Console.WriteLine("Please enter your physicsI marks");

phyI = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please inter your chemistryI marks");

chemI = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("please enter your mathematicsI marks");

mathI = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please enter your islamiatI marks");

islI = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please enter your englishI marks");

engI = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please enter your urduI marks");

urdI = Convert.ToInt32(Console.ReadLine());

obtnumI = phyI + chemI + mathI + islI + engI + urdI;

persentageI = (obtnumI * 100) / 550;

avgmarksI = obtnumI / 6;

Console.WriteLine("you obtained {0} marks and your persentage is {1} and your average marks are {2}", obtnumI, persentageI, avgmarksI);

}

else

if (op == '2')

{

Console.WriteLine("Please enter your 2nd year marks");

Console.WriteLine("Please enter your physicsII marks");

phyII = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please inter your chemistryII marks");

chemII = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("please enter your mathematicsII marks");

mathII = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please enter your islamiatII marks");

islII = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please enter your englishII marks");

engII = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Please enter your urduII marks");

urdII = Convert.ToInt32(Console.ReadLine());

obtnumII = phyII + chemII + mathII + islII + engII + urdII;

persentageII = (obtnumII * 100) / 550;

avgmarksII = obtnumII / 6;

Console.WriteLine("you obtained {0} marks and your persentage is {1} and your average marks are {2}", obtnumII, persentageII, avgmarksII);

}

else

if (op == '3')

{

Console.WriteLine("Please inter your 1st year and 2nd year marks");