C# Show variables

Question

I'm starting with the C# language making console "apps". This one is to make grade averages. It doesn't show each name on each line with its own average that I still have to code. It works 100% until the //notation I've put on the code. Under that I think it's the main problem, something that I might have forgotten to add or something.

namespace Repeat
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.BackgroundColor = ConsoleColor.Black;
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine("grade averages\n");
            Console.ResetColor();

            Console.WriteLine("");

            float studentNumber;
            float testNumber;
            string name = "0";
            string test;
            float average = 0;

            Console.WriteLine("Type the student number");
            float.TryParse(Console.ReadLine(), out studentNumber);

            Console.WriteLine("Type the number of tests");
            float.TryParse(Console.ReadLine(), out testNumber);
            Console.WriteLine("");

            for (int a = 1; a <= studentNumber; a++)
            {

                Console.WriteLine("Type the student name " + a + ":");
                nome = Console.ReadLine();
                for (int p = 1; p <= testNumber; p++)
                {
                    Console.WriteLine("Type the grade of test " + p + ":");
                    prova = Console.ReadLine();
                }
                Console.WriteLine("");
            }

            //All above is working 100%

            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine("Students average:");
            Console.ResetColor();
            Console.WriteLine("");

            for (int a = 1; a <= studentNumber; a++)
            {
                Console.WriteLine(name + ":" + average);
            }

            Console.ReadKey();
        }
        }
    }

Answer 1

You're entering the names of the students and the test scores, but you need to save those values somewhere so that you can display them again.

This is just a basic example. You could add another class to your project like this:

public class StudentScoreCollection
{
    private List<float>() _testScores = new List<float>();
    public string StudentName {get;set;}
    public List<float> TestScores {get{return _scores}}
}

Then, in your main program, declare a variable like

var scores = new List<StudentScoreCollection>();

Each time you start with a new student name (inside the first for loop) declare

var score = new StudentScore();
score.Name = Console.ReadLine();

Then as each score is entered,

score.TestScores.Add(float.Parse(Console.ReadLine());

(There's no validation here - it will blow up if they enter something that isn't a number.)

Then at the end,

scores.ForEach(score => Console.WriteLine(score.name + score.TestScores.Average());

I wrote that as a LINQ expression. That can be confusing at first. It's more readable as a for-each loop. This is the exact same thing:

foreach(var score in scores)
{
    Console.WriteLine(score.name + score.TestScores.Average();
}

Once you create a class that represents data that logically belongs together - like a name and a list of related scores - the rest becomes a little easier to work with.

Answer 2

Every time you read the names and test-results of the students, you overwrite the previous value. You should store the names and grades (and possibly do some averaging-calculations). One example would be to use a Dictionary<string,List<int>> or Dictionary<string,List<string>>, where the name is stored in the Key, and the grades are stored as a list in the Value.

The Dictionary class is from the namespace System.Collections.Generic.

Here is the documentation for the Dictionary.