Write a C# program that determines a student’s grade.

The program will read three types of scores(quiz score, mid-term score, and final score) and determine the grade based on the following rules:

-if the average score =90% =>grade=A
-if the average score >= 70% and <90% => grade=B
-if the average score>=50% and <70% =>grade=C
-if the average score<50% =>grade=F
Solution:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Csharp_exercises
{
class Program
{
static void Main(string[] args)
{


float quiz_score;
float mid_score;
float final_score;
float avg;
Console.Write("Enter quiz score:");
quiz_score=float.Parse(Console.ReadLine());
Console.Write("Enter mid-term score:");
mid_score = float.Parse(Console.ReadLine());
Console.Write("Enter final score:");
final_score = float.Parse(Console.ReadLine()); 
avg = (quiz_score +mid_score+final_score) / 3;

if (avg >= 90) Console.WriteLine("Grade A");
else if ((avg >= 70) && (avg < 90)) Console.WriteLine("Grade B");
else if ((avg >= 50) && (avg < 70)) Console.WriteLine("Grade C");
else if (avg < 50) Console.WriteLine("Grade F");
else Console.WriteLine("Invalid input");


Console.ReadLine(); 
     }
  }
}