Question

Create a program to prompt a user to enter the names and grades for a class of students

No of students = 3, Taking Maths, English, Science

Output should be in the form: First name , Last name, Maths grade, English , Science

-calculate the average grade for each student and display if they have gained over 60%

-Modify the code to allow the user to decide the number of students to be entered.
-Add a search facility to display the grades for a specific student
-Add a search facility to find who got the highest grade in a specific subject

Answer 1

Answer on Question#62454 – Programming – C#

Student.cs:

namespace FreelanceStudents
{
using System;
using System.Collections.Generic;
public struct Student
{
public Guid Id { get; set; }
public string Name { get; set; }
public IEnumerable<DisciplineGrade> DisciplineGrades { get; set; }
public override bool Equals(object obj)
{
return base.Equals(obj);
}
public bool Equals(Student other)
{
return Id.Equals(other.Id) && string.Equals(Name, other.Name) && Equals(DisciplineGrades, other.DisciplineGrades);
}
public override int GetHashCode()
{
unchecked
{
var hashCode = Id.GetHashCode();
hashCode = (hashCode*397) ^ (Name != null ? Name.GetHashCode() : 0);
hashCode = (hashCode*397) ^ (DisciplineGrades != null ? DisciplineGrades.GetHashCode() : 0);
return hashCode;
}
}
}
}

DisciplineGrade.cs:

namespace FreelanceStudents
{
using System;
public struct DisciplineGrade
{
public Guid Id { get; set; }
public string DisciplineName { get; set; }
public int Grade { get; set; }
public Guid StudentId { get; set; }
public Student Student { get; set; }
}
}

Program.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace FreelanceStudents
{
class Program
{
private const string MathName = "Math";
private const string EnglishName = "English";
private const string ScienceName = "Science";
static void Main(string[] args)
{
Console.WriteLine("Enter number of students");
var numberOfStudents = int.Parse(Console.ReadLine());
var students = new Student[numberOfStudents];
for (var i = 0; i < numberOfStudents; i++)
{
Console.WriteLine("Enter name of student");
var studentName = Console.ReadLine();
Console.WriteLine($"Enter grade in {MathName}");
var mathGrade = int.Parse(Console.ReadLine());
Console.WriteLine($"Enter grade in {EnglishName}");
var englishGrade = int.Parse(Console.ReadLine());
Console.WriteLine($"Enter grade in {ScienceName}");
var scienceGrade = int.Parse(Console.ReadLine());
var studentId = Guid.NewGuid();
var student = new Student
{
Id = studentId,
Name = studentName,
DisciplineGrades = new List<DisciplineGrade>
{
new DisciplineGrade
{
Id = Guid.NewGuid(),
DisciplineName = MathName,
Grade = mathGrade,
StudentId = studentId
},
new DisciplineGrade
{
Id = Guid.NewGuid(),
DisciplineName = EnglishName,
Grade = englishGrade,
StudentId = studentId
},
new DisciplineGrade
{
Id = Guid.NewGuid(),
DisciplineName = ScienceName,
Grade = scienceGrade,
StudentId = studentId
}
}
};
students[i] = student;
}
foreach (var student in students)
{
var averageGrade = student.DisciplineGrades.Average(dg => dg.Grade);
var studentGrades = GetGradesForStudent(student);
Console.WriteLine($"{studentGrades}");
Console.WriteLine($"{student.Name} average grade is: {averageGrade}");
if (averageGrade > 60)
{
Console.WriteLine($"{student.Name} has gained over 60%! Congratulations!");
}
}
Console.WriteLine("Search for grades of student: (enter name of student)");
var studentSearchName = Console.ReadLine();
var searchStudentItem = students.FirstOrDefault(st => st.Name == studentSearchName);
Console.WriteLine(searchStudentItem.Equals(default(Student))
? "Student with provided name has not found"
: GetGradesForStudent(searchStudentItem));
Console.WriteLine("Enter subject to find greatest grade");
var subjectToFindGrade = Console.ReadLine();
var searchSubjectItems = students.SelectMany(st => st.DisciplineGrades.Where(dg => dg.DisciplineName == subjectToFindGrade));
var subjectItemWithMaxGrade =
searchSubjectItems.First(si => si.Grade == searchSubjectItems.Max(i => i.Grade));
subjectItemWithMaxGrade.Student = students.Single(st => st.Id == subjectItemWithMaxGrade.StudentId);
Console.WriteLine(!searchSubjectItems.Any()
? "Subject with provided name has not found"
: $"{subjectItemWithMaxGrade.Student.Name} has gained max score on subject {subjectItemWithMaxGrade.DisciplineName}: {subjectItemWithMaxGrade.Grade}");
private static string GetGradesForStudent(Student student)
{
return $"{student.Name} " + string.Join(" | ", student.DisciplineGrades
.Select(dg => string.Join(" ", dg.DisciplineName, ":", dg.Grade)));
}
}
}