tests score and grades score

program.cs

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

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

            for (int n = 0; n < 10; n++)
            {
                accumulate = Convert.ToInt32(Console.ReadLine());
                if (accumulate > 10)
                { Console.WriteLine("please enter a valid score not above 10");
                    n--; }
                else

                    score = score + accumulate;
            }

            if (score <= 100 && score >= 70)
            {
                Console.WriteLine("distinction");
            Console.WriteLine("A {0}", score);
            }
            else if (score <= 69 && score >= 55)
            { 
                Console.WriteLine("credit");
                Console.WriteLine("C {0}", score);
            }
            else if (score <= 54 && score >= 40)
            { 
                Console.WriteLine("pass");
                Console.WriteLine("P {0}", score);
            }
            else if (score <= 39 && score >= 0)
            { 
                Console.WriteLine("failed");
                Console.WriteLine("F {0}", score);
            }
            Console.ReadLine();


        }
    }
}