class and take home assignments

addition with add class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace add_with_method_add
{
    class Program
    {
        static void Main(string[] args)
        {
            double var1, var2;
            double added;
            var1 = Convert.ToDouble(Console.ReadLine());
            var2 = Convert.ToDouble(Console.ReadLine());
            added = myAdd.addSum(var1, var2);
            Console.WriteLine(added);
            Console.ReadLine();
        }
    }
}

    class myAdd
    {
        public static double addSum(double a, double b)
        {
            
            return a + b;
        }
    }

Class1.cs a print to screen library

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace printOut
{

    class printer
    {
        public void Write(string stringA)
        {
            Console.WriteLine("===== {0} =====", stringA);
        }
    }
}

Program.cs display random num and write to file

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace display_random
{
    class Program
    {
        static void Main(string[] args)
        {
            double myRand;
            List<double> myList = new List<double>();
            Random randomGenerate = new Random();

            for (int i = 0; i < 10000; i++)
            {
                myRand = 10000 * randomGenerate.NextDouble() + 1;
                myList.Add(myRand);
                
               foreach(int num in myList)
                    {
                    Console.WriteLine("{0} ", num);
                    string num2 = Convert.ToString(num);
                    
                    File.AppendAllText("../random.txt", num2);
                    };



            }

            Console.ReadLine();

         }
    }
}

quadratic eqn

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace quadratic_eqn
{
    class Program
    {
        static void Main(string[] args)
        {
           
                double a;
                double b;
                double c;

                double square_b;
                double neg_b;
                double two_a;
                double neg_four_a_c;
                double square_b_minus_4ac;
                double root_of_square_b_4ac;
                double upper_calc_one;
                double upper_calc_two;
                double x_one;
                double x_two;

                a = Convert.ToDouble(Console.ReadLine());
                b = Convert.ToDouble(Console.ReadLine());
                c = Convert.ToDouble(Console.ReadLine());

                square_b = b * b;
                neg_b = b * (-1);
                two_a = 2 * a;
                neg_four_a_c = 4 * a * c * (-1);
                square_b_minus_4ac = square_b - neg_four_a_c;

                if (square_b_minus_4ac < 0)
                    Console.WriteLine(" quadratic equation has no solution");
                else
                {
                    root_of_square_b_4ac = Math.Sqrt(square_b_minus_4ac);
                    upper_calc_one = neg_b + root_of_square_b_4ac;
                    upper_calc_two = neg_b - root_of_square_b_4ac;

                    x_one = upper_calc_one / two_a;
                    x_two = upper_calc_two / two_a;


                    Console.WriteLine("x1= {0}", x_one);
                    Console.WriteLine("x2= {0}", x_two);
                    Console.ReadLine();
                }
            }
           
        }
    }
}

test for divisibility

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace test_for_divisibility_248
{
    class Program
    {
        static void Main(string[] args)
        {
            double test0 = 0; 
            double test =0;
            Console.WriteLine("input number to be tested");
            test0 = Convert.ToDouble(Console.ReadLine());

            if (test0 == 0)
                Console.WriteLine("number not divisible by 8");
                   
            if (test0 >= 8 && test0 != 0)
                test = test0 % 8;

            if (test == 0)
                Console.WriteLine("number divisible by 8");
            else
                Console.WriteLine("number not divisible by 8");
            //Console.WriteLine(test);

            Console.ReadLine();
        }
    }
}

test for pass or failed

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace test_pass_or_fail
{
    class Program
    {
        static void Main(string[] args)
        {
            int accumulate = 0;
            int score;
            int for_loop = 0;

            for (for_loop=0; for_loop<10; for_loop++)
            {
                accumulate = Convert.ToInt32(Console.ReadLine());
                score = score + accumulate;
            }

            if (score >= 70)
            
                Console.WriteLine("student passed"); 
            else
                Console.WriteLine("student failed");

            Console.ReadLine();
            
        }
    }
}