Question

Write the class "Tests". Ensure that it stores a student's first name, last name, all five test scores, the average of those 5 tests' scores and their final letter grade. (Use an array to store test scores.) Add constructors and methods to manipulate the data stored in an object of this class. Among other things, your class must contain accessors and mutators for the stored data (for example: return a student's letter grade, and modify individual test scores), a method that calculates the average of the 5 test scores, a method that takes their average test scores and determines their final letter grade. Lastly, include a method that returns all object data (including the student's name, five test scores, average, and letter grade) as a single string. Write a program to calculate 10 students' average test scores and the grade. (You will ask the user to input all students and their grades). You may assume the following input data: Jack Johnson 85 83 77 91 76 Lisa Aniston 80 90 95 93 48 Andy Cooper 78 81 11 90 73 Ravi Gupta 92 83 30 69 87 Bonny Blair 23 45 96 38 59 Danny Clark 60 85 45 39 67 Samantha Kennedy 77 31 52 74 83 Robin Bronson 93 94 89 77 97 Sun Xie 79 85 28 93 82 Kiran Patel 85 72 49 75 63 Use an array of objects of the class Tests (designed in step 1) to store each student's data. The program should output data as close as possible to the following form: First Name Jack Lisa Andy Ravi Bonny Last Name Johnson Aniston Cooper Gupta Blair Clark Kennedy Bronson Xie Patel Test1 Test2 Test3 Test4 Test5 Average Grade 85.00 83.00 77.00 91.00 76.00 82.40 B 80.00 90.00 95.00 93.00 48.00 81.20 78.00 81.00 11.00 90.00 73.00 66.60 D 92.00 83.00 30.00 69.00 87.00 72.20 23.00 45.00 96.00 38.00 59.00 52.20 60.00 85.00 45.00 39.00 67.00 59.20 77.00 31.00 52.00 74.00 83.00 63.40 93.00 94.00 89.00 77.00 97.00 90.00 79.00 85.00 28.00 93.00 82.00 73.40 85.00 72.00 49.00 75.00 63.00 68.80 Danny Samantha Robin Sun Kiran JODOTTO Class Average = 70.94

Could someone show how to do this in C#? I keep getting errors for mine and the other answers on here that are similar doesn't work. And please make sure it accepts user input.

Answer 1

C# Program:

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

namespace StudentScoresAvg
{
    //Student Class
    class Student
    {
        private int[] scores;
        private String fName;
        private String lName;

        //Constructor
        public Student(String first, String last, int s1, int s2, int s3, int s4, int s5)
        {
            fName = first;
            lName = last;

            //Storing scores in array
            scores = new int[5];
            scores[0] = s1;
            scores[1] = s2;
            scores[2] = s3;
            scores[3] = s4;
            scores[4] = s5;
        }

        //Storing individual score
        public void setScore(int value, int index)
        {
            scores[index] = value;
        }
        
        //Storing names
        public void setFName(String first)
        {
            fName = first;
        }

        //Storing names
        public void setLName(String last)
        {
            lName = last;
        }

        //Return score
        public int getScore(int index)
        {
            return scores[index];
        }

        //Returning names
        public String getFName()
        {
            return fName;
        }

        public String getLName()
        {
            return lName;
        }

        //Method that calculates average
        public double getAverage()
        {
            double sum = 0, avg;

            for (int i = 0; i < 5; i++)
            {
                sum += scores[i];
            }

            avg = sum / 5.0;

            return avg;
        }

        //Method that returns letter grade
        public String getLetterGrade(double avg)
        {
            if (avg >= 90)
                return "A";
            else if (avg >= 80)
                return "B";
            else if (avg >= 70)
                return "C";
            else if (avg >= 60)
                return "D";
            else
                return "F";
        }
        
        //Method that returns the string
        public String printStudent()
        {
            String st = "";
            st = string.Format("{0,-15}{1,-15}{2,-8:0.00}{3,-8:0.00}{4,-8:0.00}{5,-8:0.00}{6,-8:0.00}{7,-8:0.00}{8,-10}", fName, lName, scores[0], scores[1], scores[2], scores[3], scores[4], getAverage(), getLetterGrade(getAverage()));
            return st;
        }
    }

    class Program
    {
        //Main method
        static void Main(string[] args)
        {
            //Reading Student info
            String fName, lName;
            int[] scores = new int[5];
           double classAvg, classSum=0;

            Student[] students = new Student[10];

            //Reading data
            for (int i = 1; i <= 10; i++)
            {
                //Reading names
                Console.Write("\n\n Enter Student First Name: ");
                fName = Console.ReadLine();

                Console.Write("\n Enter Student Last Name: ");
                lName = Console.ReadLine();

                Console.WriteLine("\n Enter five scores: ");

                //Reading scores
                for (int j = 0; j < 5; j++)
                {
                    scores[j] = Convert.ToInt32(Console.ReadLine());
                }

                //Creating object
                students[i - 1] = new Student(fName, lName, scores[0], scores[1], scores[2], scores[3], scores[4]);
            }

            String[] arg = { "First Name", "Last Name", "Test 1", "Test 2", "Test 3", "Test 4", "Test 5", "Average", "Grade" };
            String st = string.Format("{0,-15}{1,-15}{2,-8}{3,-8}{4,-8}{5,-8}{6,-8}{7,-8}{8,-10}", arg);

            //Printing header
            Console.WriteLine("\n\n" + st + "\n");

            //Printing Student info
            for (int i = 1; i <= 10; i++)
            {
                Console.WriteLine(students[i - 1].printStudent());
               classSum += students[i - 1].getAverage();
            }

           classAvg = classSum / 10.0;
           Console.WriteLine("\n\nClass Average: " + string.format({0, 8:00}, classAvg));
  
            Console.ReadKey();
        }
    }
}

_________________________________________________________________________________________________

Sample Run with two students info:

file:///c:/users/saibabu/documents/visual studio 2010/Projects/StudentScoresAvg/StudentScoresAvg/bin/Debug/StudentSco Enter Student First Name : Jack Enter Student Last Name : Johnson Enter five scores: 85 83 77 91 76 Enter Student First Name : Lisa Enter Student Last Name : Aniston Enter five scores: 80 90 95 93 48 First Name Last Name Test 1 Test 2 Test 3 Test 4 Test 5 Average Grade 85.00 83.00 77.00 91.00 26.00 82.40 B 80.00 90.00 95.00 93.00 48.00 81.20 B Jack Lisa Johnson Aniston