C#•2d ago

code explaination

hi im new and i would really like someone more advanced to explain what this code does and also answer up my following up questions, thanks :D

83 Replies

mich4sOP•2d ago

mich4sOP•2d ago

for example this one, is there any way i could make the variable binary an integer but still having the 101010 when i WriteLine it? same with hexn can i have it stored in an int variable?

MODiX•2d ago

Angius

REPL Result: Success

int binary = 0b101010;
Console.WriteLine($"Number is {binary:X}");

int binary = 0b101010;
Console.WriteLine($"Number is {binary:X}");

Console Output

Number is 2A

Number is 2A

Compile: 444.430ms | Execution: 29.194ms | React with ❌ to remove this embed.

Angius•2d ago

0b prefix 0o for octal, 0x for hexadecimal

mich4sOP•2d ago

since when was octal added? also how to convert from binary to hexadecimal and store it in one variable like int hexNumber

Jimmacle•2d ago

and .ToString("B") will turn the number into a binary string in the most recent versions of .NET

Angius•2d ago

Integer is integer Hex, oct, dec, bin No matter It's the same value

mich4sOP•2d ago

yeah i know but like uhhh i want it to display by default in the given number system

Angius•2d ago

That :X displays in hex :B would display in bin, IIRC

Jimmacle•2d ago

the default is decimal, any other format you need the format specifier

Jimmacle•2d ago

https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings

Standard numeric format strings - .NET

In this article, learn to use standard numeric format strings to format common numeric types into text representations in .NET.

MODiX•2d ago

Angius

REPL Result: Success

int binary = 0b101010;
Console.WriteLine($"Hex {binary:X}");
Console.WriteLine($"Dec {binary}");
Console.WriteLine($"Bin {binary:B}");

int binary = 0b101010;
Console.WriteLine($"Hex {binary:X}");
Console.WriteLine($"Dec {binary}");
Console.WriteLine($"Bin {binary:B}");

Console Output

Hex 2A
Dec 42
Bin 101010

Hex 2A
Dec 42
Bin 101010

Compile: 415.012ms | Execution: 70.977ms | React with ❌ to remove this embed.

mich4sOP•2d ago

okay thanks i think i understand that okay can someone explain how does substring work? like lets say that my string is WillSmith

MODiX•2d ago

Angius

REPL Result: Success

"123456789".Substring(2, 3)

"123456789".Substring(2, 3)

Result: string

Compile: 228.866ms | Execution: 17.747ms | React with ❌ to remove this embed.

Angius•2d ago

(start_index, length)

mich4sOP•2d ago

thats all?

Angius•2d ago

mich4sOP•2d ago

oh that seems easy

Angius•2d ago

Also

mich4sOP•2d ago

yeah

leowest•2d ago

bonus points if its ranges

MODiX•2d ago

Angius

REPL Result: Success

"1234567890"[1..5]

"1234567890"[1..5]

Result: string

Compile: 206.900ms | Execution: 26.016ms | React with ❌ to remove this embed.

Angius•2d ago

This takes all letters from index 1 (inclusive) to index 5 (exclusive)

mich4sOP•2d ago

i only had the .Substring thing on my lessons

Angius•2d ago

A substring also works Ranges and indices were added merely a few years ago, the academia did not have the time to catch up yet :KEKW:

mich4sOP•2d ago

i think that my teacher knows that but he didnt want to overwhelm us like we are doing more than we should be already as he said

Angius•2d ago

Yeah, makes sense

mich4sOP•2d ago

its my 3rd month of learning from the scratch never touched c# before

mich4sOP•2d ago

can i change the separators1 to something else inside the .Split ? like so that instead of the name separators1 i have them listed

Angius•2d ago

Like, directly there, without a variable?

MODiX•2d ago

Angius

REPL Result: Success

"a,b,c;d".Split([',', ';'])

"a,b,c;d".Split([',', ';'])

Result: string[]

[
  "a",
  "b",
  "c",
  "d"
]

[
  "a",
  "b",
  "c",
  "d"
]

Compile: 288.905ms | Execution: 96.755ms | React with ❌ to remove this embed.

Angius•2d ago

This works

mich4sOP•2d ago

so the code will be like this?

Angius•2d ago

yup And the separators1 line can be deleted now

mich4sOP•2d ago

yeah alright alright

mich4sOP•2d ago

can you explain how this throw new works? @Angius

Angius•2d ago

It throws the given exception

mich4sOP•2d ago

wdym by throws

Angius•2d ago

Causes an error to happen

mich4sOP•2d ago

is the throw connected to try and catch in my main segment of the code

Angius•2d ago

Yes

mich4sOP•2d ago

where i have catch(ArgumentOutOfRangeException

Angius•2d ago

Thrown exceptions can be caught

mich4sOP•2d ago

so if i throw the exception FormatException and inside of my catch of formatexception i have console.writeline("bad error") "bad error" will appear on my screen ?

Angius•2d ago

Yep

MODiX•2d ago

Angius

REPL Result: Success

try {
    throw new Exception("henlo");
} catch {
    Console.WriteLine("Error happened!");
}

try {
    throw new Exception("henlo");
} catch {
    Console.WriteLine("Error happened!");
}

Console Output

Error happened!

Error happened!

Compile: 397.044ms | Execution: 24.897ms | React with ❌ to remove this embed.

mich4sOP•2d ago

okay i think i understand it now also when i have colors of the console text for example red how do i make it ? and how to transfer it into a function for example a function DisplayMessage that gets a string (what to display) and color of the text also my teacher told me that there were some exception order? like from the most describing to the least could you sort it out so that it gives me more specific outputs if it happens? list: argumentoutofrangeexception, formatexception, exception, dividebyzeroexception, invalidoperationexception @Angius

Angius•2d ago

Regarding the first one, set Console.ForegroundColor Regarding exceptions, I think it's about inheritance? All exceptions, generally, inherit from Exception. Then, other exceptions can inherit those If you catch Exception, you will catch any exception If you catch FormatException, you will catch only that, and all that inherit from it

mich4sOP•2d ago

my teacher made it so that there were some special ones that had different attributes such as the console color and then the general one when an unknown error occured if u understand what i mean

mich4sOP•2d ago

also how does this work? it outputs Number cannot be less than zero (Parameter 'a') okay so which one is the most specific and which one is the least?

Angius•2d ago

Well, since Exception is the base of them all, it will be the least specific For the others, look them up in the documentation, see what they inherit from

mich4sOP•2d ago

okay what about the img?

Angius•2d ago

ArgumentOutOfRangeException override's Exception's Message property, and formats it in the way that you see It also has a constructor that takes multiple parameters

Angius•2d ago

Here's the string, string one you're using

mich4sOP•2d ago

i dont understand everything in it like your img

Angius•2d ago

No need to understand everything I'm just showing you that exceptions can have whatever code inside of them you want They can have constructors with multiple parameters and everything And they can format the message however you want

mich4sOP•2d ago

ohhhhh okay btw do i take the color with string into the function? or is there any other variable

Angius•2d ago

Not sure what you mean Yes, you can move the coloring code and stuff into a separate function

mich4sOP•2d ago

yes but like is it static void DisplayMessage(string message, string color)

Angius•2d ago

$tias

MODiX•2d ago

https://images-ext-1.discordapp.net/external/CO2vsU2aXbRqYy1RdewOYnkBq1nGFBjdbjlNgjvG67A/https/media.discordapp.net/attachments/364492811489509376/964064233035816990/unknown.png?width=543&height=257

Angius•2d ago

You're making this method You decide

mich4sOP•2d ago

idk how to write it sorry

mich4sOP•2d ago

thats what came up

Angius•2d ago

What do you mean "came up"?

mich4sOP•2d ago

alt + enter to create the private static void

Angius•2d ago

Right Well First and foremost, that's not how you call methods You don't write Console.WriteLine(string "hello world") so why is it DisplayMessage(string message)?

mich4sOP•2d ago

huh?

Angius•2d ago

DisplayMessage(message, color)

mich4sOP•2d ago

okay now it works kinda wait

mich4sOP•2d ago

Angius•2d ago

Yeah Except Console.ForegroundColor is not of type string It's of type ConsoleColor

mich4sOP•2d ago

oh okay

mich4sOP•2d ago

it works now :D

Angius•2d ago

Nice You could also just use it with

DisplayMessage("words to display", ConsoleColor.Red);

DisplayMessage("words to display", ConsoleColor.Red);

mich4sOP•2d ago

oh makes sense yeah thanks i guess no more questions

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