Question

Instructions We're going to create a program which will allow the user to add values to a list, print the values, and print the sum of all the values. Part of this program will be a simple user interface. 1. In the Program class, add a static list of doubles: private statie List _values new List) this is the list of doubles well be working with in the program. 2. Add ReadInteger (string prompt) , and ReadDouble(string prompt) to the Program class. These should be identical to those in 5.1P. 3. Add a public enum named Useroption Give it the values/options of: Newvalue Sum, Quit . This enumeration will be used later on in the program to create the user Print interface menu. and public enum Useroption // values 4. One of the actions our user will be able to take is to add a new value into the list. Let's create the method that will do this. Here is something to get you started: public statie void AddValueToListo // code goes here Remember, we can use the Add) method on the List class to add items to a list, and we can use the ReadDouble() method to get a value from the user. 5. The second action our program can perform is printing values to the screen. To do this, create another public static void method named Print() .In Print0, use a foreach loop to iterate over values ,printing each value to the console. 6. Finaly, we need to be able to sum the values. This is yet another public static void method, which should do the following: Create a local double variable called sum and initialise it to O Use a foreach loop to iterate over each element in values - .Each iteration, add the value in each element to the sum. Write sum to the console. 7. Now that we have the functionality of our list implemented in our code, let's add the code which will allow the user to interact with the program! Let's take a look at the ReadUserOption) method: public static Useroption ReadUseroption() Console.WriteLine ( "Enter 0 to add a value") Console.WriteLine( "Enter 1 to add a sus all values) Console.WriteLine( Enter 2 to print a sum all values) Console.WriteLine("Enter 3 to quit) int option 3: Int.32.TryParse(Console.Readtine) out option)s return (Useroption)option You can see it simply presents the possible options to the user, and then reads the option from the user. Note that by default, the method will return 3 (exit). ° Create the Main ( ) method. The Main method should loop until the user opts to quit, each time it should switch (ReadUseroption()) value to call the appropriate method and use the returned Useroption

Answer 1

Screenshot

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Program

//Packages
using System;
using System.Collections.Generic;
namespace Program
{
    class Program
    {
        //Create a list
        private static List<double> _values = new List<double>();
        //Enum variable
        public enum UserOption
        {
            NewValue,
            Sum,
            Print,
            quit
        }
        //Main method
        static void Main(string[] args)
        {
            //Call method to get user choice
            UserOption option = ReadUserOption();
            //Loop unti quit
            while (option != UserOption.quit)
            {
                //Select each option
                switch (option)
                {
                    //Add a new value into list
                    case UserOption.NewValue:
                        AddValueToList();
                        break;
                    //Print the list
                    case UserOption.Print:
                        Print();
                        break;
                    //Find sum of the elements in the list
                    case UserOption.Sum:
                        Sum();
                        break;
                    default:
                        break;
                }
                //Repeat
                Console.WriteLine();
                option = ReadUserOption();
            }
          
        }
        //Method to read value for the list input
        public static double ReadDouble(String prompt)
        {
            Console.Write(prompt);
            double value;
            if (!double.TryParse(Console.ReadLine(), out value))
            {
                Console.WriteLine("Not a double value!!");
            }
            return value;
        }
        //Method to add values intp list
        public static void AddValueToList()
        {
            _values.Add(ReadDouble("Enter a double value into list: "));
        }
        //Method to print elements in the list
        public static void Print()
        {
            Console.Write("List: [ ");
            foreach(double value in _values)
            {
                Console.Write(value + " ");
            }
                Console.Write("]");
        }
        //Method to find sum of all the elements in the list
        public static void Sum()
        {
            double sum = 0;
            foreach (double value in _values)
            {
                sum += value;
            }
            Console.WriteLine("Sum of all values in the list is " + sum);
        }
        //User choice display
        public static UserOption ReadUserOption()
        {
            Console.WriteLine("Enter 0 to add a value");
            Console.WriteLine("Enter 1 to add a sum all values");
            Console.WriteLine("Enter 2 to print a sum all values");
            Console.WriteLine("Enter 3 to quit");
            int option = 3;
            Int32.TryParse(Console.ReadLine(), out option);
            return (UserOption)option;
        }

    }
}

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Output

Enter 0 to add a value
Enter 1 to add a sum all values
Enter 2 to print a sum all values
Enter 3 to quit
0
Enter a double value into list: 5.5

Enter 0 to add a value
Enter 1 to add a sum all values
Enter 2 to print a sum all values
Enter 3 to quit
0
Enter a double value into list: 6.2

Enter 0 to add a value
Enter 1 to add a sum all values
Enter 2 to print a sum all values
Enter 3 to quit
0
Enter a double value into list: 7.1

Enter 0 to add a value
Enter 1 to add a sum all values
Enter 2 to print a sum all values
Enter 3 to quit
1
Sum of all values in the list is 18.8

Enter 0 to add a value
Enter 1 to add a sum all values
Enter 2 to print a sum all values
Enter 3 to quit
2
List: [ 5.5 6.2 7.1 ]
Enter 0 to add a value
Enter 1 to add a sum all values
Enter 2 to print a sum all values
Enter 3 to quit
3