How to rectify this C# error because I am a beginner

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C#

1.	using System;
2.	namespace Examples
3.	{
4.		 class Program
5.	{
6.		public static void Main(string[]args)
7.		{
8.			Laptop Lenovo=new Laptop("Lenovo");
9.			Lenovo.Price("$");
10.			Lenovo.Processor("i");
11.			Lenovo.Ram(2);
12.			Lenovo.HDD(500);
13.			
14.			Laptop Dell=new Laptop("Dell");
15.			Dell.Price("$");
16.			Dell.Processor("i");
17.			Dell.Ram(4);
18.			Dell.HDD(1);
19.			
20.			Laptop Sony=new Laptop("Sony");
21.		    Sony.Price("$");
22.			Sony.Processor("i");
23.			Sony.Ram(8);
24.			Sony.HDD(1);
25.			
26.			
27.		}
28.	}
29.	class Laptop:LaptopBase
30.	{
31.		public  LaptopBase(String LaptopName):base(LaptopName)
32.		{
33.			this.LaptopBase=LaptopName;
34.		
35.		  	} 
36.		class LaptopBase
37.		{
38.			public LaptopBase(String LaptopName)
39.			{
40.				Console.WriteLine(" "+LaptopName);
41.			}
42.		
43.		
44.		public void Price()
45.		{
46.		Console.WriteLine("$"+ 1000,"$"+2000,"$"+3000);
47.		}
48.	public void Processor()
49.	{
50.	Console.WriteLine("i"+3,"i"+5,"i"+7);
51.	}
52.		public void Ram()
53.		{
54.			Console.WriteLine(2+"GB",4+"GB",8+"GB");
55.		}
56.		public void HDD()
57.		{
58.			Console.WriteLine(500+"GB",1+"TB",1+"TB");
59.		}
60.	}
61.			}
62.	}

[edit]Code block added - OriginalGriff[/edit]

What I have tried:

main.cs(31,10): error CS1520: Class, struct, or interface method must have a return type

Posted 10-Nov-17 2:31am

parth cool

Updated 10-Nov-17 2:47am

OriginalGriff

v2

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OriginalGriff · Accepted Answer · 2017-11-10T02:47:00

Look at the error message, and at your code:

main.cs(31,10): error CS1520: Class, struct, or interface method must have a return type

main.cs(31,10):

This means the error is on line 31, column 10, of the file "main.cs"
So look at that line:

C#

29.	class Laptop:LaptopBase
30.	{
31.		public  LaptopBase(String LaptopName):base(LaptopName)
32.		{
33.			this.LaptopBase=LaptopName;

That's a constructor: but it's a constructor of the base class, not the actual class. As a result, your get this error:

error CS1520: Class, struct, or interface method must have a return type

Because you can only create a constructor in the class that it refers to.
Probably, you need to declare a Laptop constructor, not a LaptopBase - which would get rid of that error, but...
1) LaptopBase is a class, not a variable, so you can't assign a string to it.
2) Declaring the base class as part of the class that derives from it is ... um ... odd. Very odd. How do you expect other classes to easily derive from LaptopBase if it's part of the Laptop class?

I think you need to rethink what you are trying to do here, and reread your course notes - that code very much looks like the "guess and hope it works" school of coding, and that isn't a good design strategy!