How to get the sum of integers in multiple objects?-CodePudding

I have two objects they are: Student and Courses:

public Student(string StudentID, string Name, string Status, Enum StudentMajor, Dictionary<Courses, Grade[]> CompletedCourses)

public Courses(string courseName, string courseCode, string passingGrade, int numOfCredits, List<Courses> prerequisites)

Here's the objects I created in my Main class

//Courses
Courses ITEC_120 = new("Introduction to Computer Hardware", "ITEC 120", "C", 3, new List<Courses> {});
Courses ITEC_122 = new("Introduction to Operating Systems", "ITEC 122", "C", 3, new List<Courses> { ITEC_120 });

//Student
Student student1 = new("00069110", "Antony Dos Santos", "Full-time", Majors.Computer_Information_Systems, new Dictionary<Courses, Grade[]>()
{
 { ITEC_120, new[] { Grade.F, Grade.B, Grade.Not_Taken } },
 { ITEC_122, new[] { Grade.A, Grade.Not_Taken, Grade.Not_Taken } 
},
});

As you can see the courses have a variable called credit and each Student object has a dictionary that takes a Course and a Grade

So student1 has two courses and each of the courses has 3 credits each. How would I iterate over the Dictionary to get the total of all the courses in CoursesCompleted in this case it should be 6.

Each object is added to a List

//List for Courses objects
List<Courses> CompulsoryCourses = new List<Courses>();
CompulsoryCourses.Add(ITEC_120);
CompulsoryCourses.Add(ITEC_122);//Adding the two courses to the List

List for Student objects
List<Student> students = new List<Student>();
students.Add(student1);

foreach(var stu in students)
{
var GPA = 0.0;
var CourseCredits = 0;
Console.WriteLine("\nStudent Information");
foreach (KeyValuePair<Courses, Grade[]> item in stu.CompletedCourses)
{
    var TotalCredits = CourseCredits item.Key.numOfCredits;
    Console.WriteLine("\nName: "   item.Key.courseName   ", Credits: "   item.Key.numOfCredits);
    GPA = stu.calGPA(CourseCredits);
    Console.WriteLine("Total Credits: " TotalCredits);
}
Console.WriteLine(stu.Name  ": GPA = "   GPA);

}

In the foreach loop above I'm looping through the students List, and then I use another foreach loop to iterate the Dictionary to get the Key which in this case is numOfCredits like: item.Key.numOfCredits, and add them to each other.

Currently it's only adding the numOfCredits to itself and not to the other course in the dictionary.

CodePudding user response：

You can use LINQ for something like this. If you have a list of cars and want to sum just the price you can do this:

var cars = new List<Car>
{
    new Car{ BrandName = "Lamborghini", Model = "Huracan", Price = 300000M },
    new Car{ BrandName = "Porsche", Model = "Gt3rs", Price = 200000M },
    new Car{ BrandName = "Vauxhall", Model = "Corsa", Price = 20000M }
};

var totalPrice = cars.Sum(car => car.Price);

Console.WriteLine($"Total Price: {totalPrice}");

Where 'Car' looks like this:

public class Car
{
    public string BrandName { get; set; }
    public string Model { get; set; }
    public decimal Price { get; set; }
}

CodePudding user response：

Not sure exactly what you are asking for. But adding the sum of the cars "prices" i assume.

You could create a list, where all cars are added, along with all new cars. Then what you could do it creating a for loop, thats the lengt of that spesific list. And through that loop add all values. Would look something like this:

Class creation

    class Car
    {
        public string name;
        public int price;

        public Car(string name, int price)
        {
            this.name = name;
            this.price = price;
        }
    }

Then for creating the list, and adding some cars.

            Car car1 = new Car("blue-car", 15);
            Car car2 = new Car("red-car", 15);


            List<Car> cars = new List<Car>() { car1, car2 };

And then finnaly we count the sum up.

            int totalprice = 0;
            for (int i = 0; i < cars.Count; i  )
            {
                totalprice = totalprice   cars[i].price;
            }