Have some questions about OOP code

Hello Valérie

 

I think there is a few points to consider in your code before answering your question.

You have a static void main in a class called Head the you instanciate during the execution of main. I think this is not the best way to do things.

You should call your main class Program.cs and add the main in it with the method that you want to call

1. public class Program  
2.     {  
3.         static void Main(string[] args)  
4.         {  
5.             Prod( new Product() { Name="Apple",Price=5});  
6.             Console.ReadLine();  
7.   
8.         }  
9.   
10.         public static void Prod(Product p)  
11.         {  
12.             //Product obj= new Product(); why not necessary?  
13.             if (p.Price > 0)  
14.                 Console.WriteLine("ok");  
15.         }  
16.     }  

Now to answer your question :

1) what should I give as parameter in the line Console.Write(hfd.Prod("Apple", 5)) ? (error: no overload method takes 2 arguments)

Here you are passing two parameters : The first one is string the second one is int, if your method was Prod(string name, int price) then it would be accepted but here you have Prod(Product p) so you need to pass an instanciated product to your method (see line 5 of my code)

 

2) Console.Write(Prod("Apple", 5)); same error => is line Head hfd = new Head(); then unnecessary? Can i access method Prod directly from Main?

As mentionned at the beginning, try always to define your classes outside of the main class to have a good seperation of concern.

 

 3) Apparently, the line Product obj= new Product(); is not necessary. Why?

Yes here it's not necessary, because you are passing the product as parameter, and here by this intruction you will reinstanciate the object and then you will loose the values of the product that you are passing.