Write a program to define three variables to hold three test scores. the program should ask the user to enter three test scores and then assign the values entered to the variables. the program should display the average of the test scores and the letter grade that is assigned for the test score average. use the grading scheme in the following table. 90 or greater 80-89 70-79 60-69 below 60

It's always good to use if else with boolean expressions in such cases.

Explanation:

I have written a program  where I have used c# as programming language.

I used if else block with boolean expressions to enforce conditions to print the grades according to the average of test scores. I have used Logical And(&&) operator in boolean expressions so that all the conditions in if and if else  must be true

Here is the program:  

using System;

public class Test

{

   public static void Main()

   {

       int testScore1, testScore2, testScore3;

       Console.WriteLine("enter first testScore");

       testScore1 = Convert.ToInt32(Console.ReadLine());

       Console.WriteLine("enter second testScore");

       testScore2 = Convert.ToInt32(Console.ReadLine());

       Console.WriteLine("enter third testScore");

       testScore3 = Convert.ToInt32(Console.ReadLine());

       float avg = (testScore1 + testScore2 + testScore3) / 3;

       if(avg>=90)

       {

           Console.WriteLine("You got grade A");

       }

       else if(avg >=80 && avg <=89)

       {

           Console.WriteLine("You got grade B");

       }

       else if (avg >= 70 && avg <= 79)

       {

           Console.WriteLine("You got grade c");

       }

       else if (avg >= 60 && avg <= 69)

       {

           Console.WriteLine("You got grade D");

       }

       else if(avg< 60)

       {

           Console.WriteLine("You got grade E");

       }

       else

       {

           Console.WriteLine("Sorry, You failed");

       }

       Console.ReadLine();

   }    

}

Explanation of program:  

I created three variables named, testScore1, testScore2, testScore3 of datatype int. I prompted the user to enter three test score values. Each value is read using Console.ReadLine() . As the value entered is of type integer, I converted the  console read value into int using Convert method.  

In the next step, I calculated average using the formula.  

Now, Based on the average, I can calculate the grade according to the given grading scheme.

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