can someone explain?

Question

Hello,
that's the code I have a problem with.
The problem is, that it says I can't convert a double in decimal but the number is a decimal so what should I do?

class Program
{

public delegate decimal Rechenoperation (decimal x, decimal y);

static void Main(string[] args)
{

Rechenoperation plus = (x, y) => { return x + y; };

decimal result = decimal.Parse(plus(3.534M, 3));
Console.WriteLine(result);

I also already tried this::

decimal result = decimal.Parse(plus(decimal.Parse(3.534M), 3));

and if I write it like this it says I can't convert from decimal to a string, but which string there are only numbers::

Rechaenoperation plus = (x, y) => { return x + y; };
decimal num1 = 3.534M;

decimal result = decimal.Parse(plus(num1, 3));
Console.WriteLine(result);

Please explain what is going on with c# or what I don't understand (what my mistake is).

Answer 1

Hello Michael
This is just a speculation I guess, but it makes a bit sense. As I checked the reference page:

https://docs.microsoft.com/en-us/dotnet/api/system.decimal.parse

It says "Converts the string representation of a number to its Decimal equivalent."

But in your code, `Rechenoperation` is a delegate which returns a `decimal`. So, practically, you were supplying a `decimal` into `decimal.Parse` method, which was unexpected, as the `decimal.Parse` was expecting a string as first argument.

P.S. I don't know C# much, so I'm not too sure about that 'M' suffix in `decimal` number. Maybe you can tell me about that?

Hth, cmiiw

Answer 2

hello Ipang,
the M after the decimal is a formal thing
Like if you wtite a float you also do it like this
float x = 3.14F;

at least it is a formal thing in other languages like c++ in which you can write:

float x = 1.31;
or
float x = 1.31F;

its like you write classes BIG and if you have an interface you write an I bevore the name of the interface, so that if someone is going to read your code he instantly knows that it is a Decimal or a float.

what i know is, that if you write:
float x = 1.31;
in c# it's an mistake, but in c++ not;

at least that is how I understand it if something about this commend is false please commend it

Answer 3

wcqkfnlkmfl
Thanks for information buddy 🙏

Answer 4

Michael
I suggest a removal of the words in tags Except for C#. The words 'help', 'lol', 'dont', 'understand' 'again' doesn't help improve context of question. But C# is fine 👌