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C#•17mo ago

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝n

✅ Cannot figure out what I am doing wrong.

I am currently taking classes for C#, and im kind of throwing things around with casts and things, in this I am not allowed to use an array to finish the assignment, could maybe put me in the right direction without giving me the correct awnser. The comments to the side are just reminders for myself to go off of(so don't worry about them if they are wrong.)

82 Replies

Angius•17mo ago

Why are you trying to subtract null from number...? And you should have only one StringBuilder Before the loop

Moods•17mo ago

Okay first off, you can return the StringBuilder.ToString() directly ya know :)

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

oh idk actually i got a little annoyed so i through something in there, i knew that wouldn't work

Moods•17mo ago

You don’t need a result string

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

ahh okay alright,ill try that

Angius•17mo ago

If you want to turn a number to a letter, you probably want to be adding to 'A' instead

MODiX•17mo ago

Angius

REPL Result: Success

new {
  A = (char)('A' + 0),
  B = (char)('A' + 1),
  C = (char)('A' + 2),
  // etc
}

new {
  A = (char)('A' + 0),
  B = (char)('A' + 1),
  C = (char)('A' + 2),
  // etc
}

Result: <>f__AnonymousType0#1<char, char, char>

{
  "a": "A",
  "b": "B",
  "c": "C"
}

{
  "a": "A",
  "b": "B",
  "c": "C"
}

Compile: 403.041ms | Execution: 65.320ms | React with ❌ to remove this embed.

Moods•17mo ago

Hmmm, no. How you would go about this is like this. Each character has some numerical equivalent (I think Unicode or ASCII I forgor) If you’re given a starter char

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

were woudl I apply this exactly? in the new SB?

Moods•17mo ago

What you would need to do is get its equivalent number in whatever system, then you add one to said number and add the char cast(can you do this?) to string builder in a loop

Angius•17mo ago

In the loop

Moods•17mo ago

How do I use the bot thingy, im not sure if something like (char)90 would work

Angius•17mo ago

That's how you generate consecutive characters !e [code here]

Moods•17mo ago

Thanks

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

yes but like new would throw a sythax no?

Angius•17mo ago

It was just for demonstration sake

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

since new does not exist yet, so im asking how to build that.

Angius•17mo ago

To show you how math on chars works

MODiX•17mo ago

Moods

REPL Result: Success

char foo = (char) 97;
Console.WriteLine(foo);

char foo = (char) 97;
Console.WriteLine(foo);

Console Output

Compile: 588.636ms | Execution: 26.996ms | React with ❌ to remove this embed.

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

ahh okay

Moods•17mo ago

Okay yeah that’s how I’d go about it Get the number from the starter, increment, char cast and append to your stringbuilder in a loop and return it

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

okay I tried that, but it was throughing an error for me fo some reason saying I can not convert a char to an int. ill try it again, maybe i spelled it wrong

Moods•17mo ago

Tbf, I converted an int to a char, and im surprised that even worked…

Angius•17mo ago

Why? Chars are integers Like, literally

Moods•17mo ago

Ehh I wasn’t too certain I’ve tried it out before but I wasn’t 100% it’d work

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

waiti i just noticed that says a, how does that work? is that because 97 = a and visual studio just knows that or something?

MODiX•17mo ago

Moods

REPL Result: Failure

char foo = ‘a’;
int bar = (int)foo;
Console.WriteLine(bar);

char foo = ‘a’;
int bar = (int)foo;
Console.WriteLine(bar);

Exception: CompilationErrorException

- Invalid expression term ''
- Unexpected character '‘'
- ; expected
- ; expected
- Unexpected character '’'
- The name 'a' does not exist in the current context

- Invalid expression term ''
- Unexpected character '‘'
- ; expected
- ; expected
- Unexpected character '’'
- The name 'a' does not exist in the current context

Compile: 539.812ms | Execution: 0.000ms | React with ❌ to remove this embed.

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

cause a is not to anything, im lost on that.

Moods•17mo ago

My quotes got harold

harold

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

lol

Angius•17mo ago

It's because of how char is implemented in C# A char is a wrapper around int, basically It's a number the character has on the ASCII table

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

alright, so char variable = cast of char to its number... hmm

Moods•17mo ago

Ok I confirmed 97 is the ascii code for ‘a’

MODiX•17mo ago

Angius

REPL Result: Success

string.Join(" ", Enumerable.Range(0, 100).Select(i => (char)i))

string.Join(" ", Enumerable.Range(0, 100).Select(i => (char)i))

Result: string

              
   
                     ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c

              
   
                     ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c

Compile: 581.362ms | Execution: 65.243ms | React with ❌ to remove this embed.

Moods•17mo ago

There’s still ‘A’ too but the gist is characters are numbers You’d just have to increase by one and cast and append in the loop Also banning arrays is a weird restriction

Pobiega•17mo ago

is it?

Angius•17mo ago

Idk, an array isn't necessary there

Pobiega•17mo ago

there is no array needed here or any collections at all

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

okay but to set it up, now i have my variables but how to allow it to be sit that 65('A') can be stringed with 122('z')?

Angius•17mo ago

It would just be a mostly useless intermediary step if anything

Moods•17mo ago

I mean they’re using stringbuilder so I don’t really see the point

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

cause i need to get like that kind of range which is what im lost on

Angius•17mo ago

You have the StringBuilder there, no?

Pobiega•17mo ago

You have the starter. You know how to do math on chars. You have the number. Combine the above and you're good

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

so i++ can count up, also yes I have StringBuilder but my teacher told me that would be good to use, i sadly do not know how it works.

Pobiega•17mo ago

stringbuilder builds strings

MODiX•17mo ago

Angius

REPL Result: Success

var sb = new StringBuilder();
foreach (var i in Enumerable.Range(40, 50))
{
    sb.Append((char)i);
}
sb.ToString()

var sb = new StringBuilder();
foreach (var i in Enumerable.Range(40, 50))
{
    sb.Append((char)i);
}
sb.ToString()

Result: string

()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXY

()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXY

Compile: 554.971ms | Execution: 51.162ms | React with ❌ to remove this embed.

Pobiega•17mo ago

you create it, append to it, then ToString to get the result

Moods•17mo ago

You just need to know the methods, but the basics is it’s a way to have a mutable representation of a string You really just need Append and ToString

Angius•17mo ago

You could also not use a stringbuilder ¯\_(ツ)_/¯

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

okay imma take a nother ss, tell me if i set this up right alright?

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

MODiX•17mo ago

Angius

REPL Result: Success

var result = "";
foreach (var i in Enumerable.Range(40, 50))
{
    result += (char)i;
}
result

var result = "";
foreach (var i in Enumerable.Range(40, 50))
{
    result += (char)i;
}
result

Result: string

()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXY

()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXY

Compile: 496.988ms | Execution: 60.908ms | React with ❌ to remove this embed.

Moods•17mo ago

You mean like adding to an empty string instead?

Angius•17mo ago

lgtm As demonstrated, yes

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

do what lol?

Moods•17mo ago

Wouldn’t that be slower than appending in this scenario? Or maybe since we know its range it doesn’t matter

Angius•17mo ago

Looks Good To Me

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

oh okay

Angius•17mo ago

It would be slower, yes, since each += would allocate a new string

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

so with the appeal how would i set that up?

Angius•17mo ago

But does it matter in this case?

Moods•17mo ago

Yeah fair enough it wouldn’t matter in this scenario

Angius•17mo ago

I'd say it's time you try some stuff out and see if you can figure it out

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

okay, sounds like a plan

Angius•17mo ago

If you get stuck again, come back and we'll take a look

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

alright, thank you guys im so still really confused on where im going with this. so i desided ot but an enumerial rage, from null to del, or 0, 127, but what to put into the appeal still has me very lost, is it going to be some kind of parameter, variable or a method, i wouldn't think a method since my method is string. But I can't find any referecnes online, they only give me arrays.

Pobiega•17mo ago

??? Nothing in that message makes sense Do you know what a loop is in programming?

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

I made a enumerable range, setting it form 0, 127, thats the same as null to del correct? And as well as that, i looked on the internet for a reference of appends and i got nothing.

Pobiega•17mo ago

You don't need to range anything "null to del" ??? what Your task is very straight forward, You're given a starter character you should just generate an N long string based on that starter dont worry about null, del, Enumerable.Range...

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

okay...

Pobiega•17mo ago

so bakc to my question, do you know what a loop is?

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

Yes, it continues to count up or down one + at time, starting at your first part in your for() the int i = (where you start) ((forgot the name of what its called)) and goes until the i < the item you need to finish with, and the will count up or down depending on if you ++ or -- your index.

Pobiega•17mo ago

okay, thats more or less accurate its a bit more flexible than that, but it works for this exercise Look at this: !e Console.WriteLine((char)('A'+1));

MODiX•17mo ago

Pobiega

REPL Result: Success

Console.WriteLine((char)('A'+1));

Console.WriteLine((char)('A'+1));

Console Output

Compile: 461.113ms | Execution: 23.128ms | React with ❌ to remove this embed.

Pobiega•17mo ago

so given A, we can easily get B and so forth

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

okay so since 'A' is my starting value, i will plus it by 126 to get lowercase z?

Pobiega•17mo ago

why are you trying to get lowercase z? and your starter isnt fixed, its given by a method parameter

Pobiega•17mo ago

F̸̈͑o̵̦̔r̷̈̇g̶̍̀ȍ̵͒t̵̿̓i̸͝nOP•17mo ago

thats my end value, thats why im trying to do it. okay my logic is really off, its really hard to explain because i don' t understand how to write it.

Pobiega•17mo ago

You should re-read the description

Accord•17mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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