C#•6mo ago

✅ help. i'm trying to make the last letter the first letter and vice versa

106 Replies

Pobiega•6mo ago

so if I type hello it would produce oellh?

Eve.OP•6mo ago

no it just produces hello

Eve.OP•6mo ago

it should produce this yes

Pobiega•6mo ago

right so lets break it down we need to be able to get the first and the last character, and "the middle" then we just combine them do you know how to get the first character?

Eve.OP•6mo ago

did i not get it by doing word[0]

Pobiega•6mo ago

yep! what about the last?

Eve.OP•6mo ago

i used the for loop

Pobiega•6mo ago

that seems silly, doesnt it?

Eve.OP•6mo ago

i tried to google it

Pobiega•6mo ago

we only need the last - why would we just a loop

Eve.OP•6mo ago

would it be word[word.length] idk

Pobiega•6mo ago

yeah that works there is a better way to do the same thing thou word[^1] the ^ means "start from the end"

Eve.OP•6mo ago

do i not need to convert it to an array

Pobiega•6mo ago

strings are already arrays

Eve.OP•6mo ago

but when i do this

Pobiega•6mo ago

yeah you cant use that for assigning

Eve.OP•6mo ago

Pobiega•6mo ago

you cant edit strings with indexing either and remove the loop you are trying to do everything in one go, which is just confusing do it one step at a time

var firstLetter = s[0]; // Just get the first letter
var lastLetter = s[^1]; // Equivalent to s[s.Length - 1]

var firstLetter = s[0]; // Just get the first letter
var lastLetter = s[^1]; // Equivalent to s[s.Length - 1]

we know these already, so lets use them now, how do we extract "the rest" of the string?

Eve.OP•6mo ago

does var mean string or int? or both ive never used var

Pobiega•6mo ago

its a keyword that says "the type is obvious" it tells the compiler to pick the type for you

Pobiega•6mo ago

Eve.OP•6mo ago

Pobiega•6mo ago

screenshot from my IDE, where I have "type hints" enabled

Eve.OP•6mo ago

ohhh okay

Pobiega•6mo ago

hm, are you using an old version of .NET? like, maybe .net framework?

Eve.OP•6mo ago

2022

Pobiega•6mo ago

thats visual studio

Eve.OP•6mo ago

yes im using that yes

Pobiega•6mo ago

visual studio is not the same thing as .NET $newproject

MODiX•6mo ago

When creating a new project, prefer using .NET over .NET Framework, unless you have a very specific reason to be using .NET Framework. .NET Framework is now legacy code and only get security fix updates, it no longer gets new features and is not recommended. https://cdn.discordapp.com/attachments/569261465463160900/899381236617855016/unknown.png

Pobiega•6mo ago

you have accidentally created a project using the old legacy runtime for .NET that was discontinued in 2016 so its been stale for 8 years

Eve.OP•6mo ago

im using 6th one down

Pobiega•6mo ago

yeah, see how its marked "NO" in big red letters?

Eve.OP•6mo ago

ive always used that one because it starts it off for me

Pobiega•6mo ago

you should be using .NET not .NET Framework (I know, very confusing names)

Eve.OP•6mo ago

but the .NET doesn't give me the using system etc or the name space

Pobiega•6mo ago

dont worry, thats just a template there is a way to undo it and get the "old" style program.cs back

Eve.OP•6mo ago

shall i just open a .NET and copy and paste this into it

Pobiega•6mo ago

yeah that would work

Pobiega•6mo ago

Eve.OP•6mo ago

okay ill do that now

Pobiega•6mo ago

see that box I marked with green? check it and you will get the more familiar program.cs

Eve.OP•6mo ago

Pobiega•6mo ago

yep!

Eve.OP•6mo ago

my exam is on monday though my coding one

Pobiega•6mo ago

oh this is for school? did your teacher specify a specific version to learn?

Eve.OP•6mo ago

no im just practicing for it

Pobiega•6mo ago

Eve.OP•6mo ago

we have to moderate a code already given to us so im practicing how to manipulate things

Pobiega•6mo ago

right well, create the new project and copy your stuff over

Eve.OP•6mo ago

okay ive done it and the ^1 is wokring so now i have the first and last characters

Pobiega•6mo ago

yep now we need to get "the middle"

Eve.OP•6mo ago

would that not use the for loop and start from 1 instead of 0

Pobiega•6mo ago

you could

Eve.OP•6mo ago

so i=1 instead

Pobiega•6mo ago

but there is again a better solution

Eve.OP•6mo ago

okay im listening

Pobiega•6mo ago

if you index a string with a range, you get whats called a substring word[x..y] what values do you think we should use for x and y?

Eve.OP•6mo ago

you mean data type or variable name?

Pobiega•6mo ago

no I mean value I dont suggest you actually write x and y just type the "correct" values

Eve.OP•6mo ago

i dont understand

Pobiega•6mo ago

word[0..2] for example

Eve.OP•6mo ago

erm 1..length-1

Pobiega•6mo ago

right! and what is another way to type length-1?

Eve.OP•6mo ago

lastLetter-1

Pobiega•6mo ago

^1

Eve.OP•6mo ago

^1-1

Pobiega•6mo ago

no ^1

Eve.OP•6mo ago

wait so im taking out the last letter and the first letter to get the middle

Pobiega•6mo ago

yeah

Eve.OP•6mo ago

okay

Pobiega•6mo ago

var middle = s[1..^1]; essentially, take everything from position 1 to the last, minus 1, since the upper bound is exclusive

Eve.OP•6mo ago

okay so the .. means give me everything except what i stated

Pobiega•6mo ago

ok so we know the three parts now we just need to combine them again

Eve.OP•6mo ago

so i make a new variable saying last + middle + first

Pobiega•6mo ago

kinda but we're in a method right?

Eve.OP•6mo ago

yes

Pobiega•6mo ago

so why not just return the "answer" directly?

Eve.OP•6mo ago

ahh okay wait but what would be the point in the method if im putting them back together in the main

Pobiega•6mo ago

you wouldn't

Eve.OP•6mo ago

is this wrong

Pobiega•6mo ago

yes look at what you return

Eve.OP•6mo ago

ive changed it to word words*

Pobiega•6mo ago

then its fine, but again, I would not create the wordsvariable at all I'd just return the answer

private static string FlipLetters(string s) => s[^1] + s[1..^1] + s[0];

private static string FlipLettersReadable(string s)
{
    var firstLetter = s[0]; // Just get the first letter
    var lastLetter = s[^1]; // Equivalent to s[s.Length - 1]
    var middle = s[1..^1]; // Equivalent to s.Substring(1, s.Length - 2)

    return $"{lastLetter}{middle}{firstLetter}";
}

private static string FlipLetters(string s) => s[^1] + s[1..^1] + s[0];

private static string FlipLettersReadable(string s)
{
    var firstLetter = s[0]; // Just get the first letter
    var lastLetter = s[^1]; // Equivalent to s[s.Length - 1]
    var middle = s[1..^1]; // Equivalent to s.Substring(1, s.Length - 2)

    return $"{lastLetter}{middle}{firstLetter}";
}

Eve.OP•6mo ago

what does the $ do?

Pobiega•6mo ago

I included the "code golf" version here too, to show how small this code can be 🙂 thats string interpolation its a better way of combining things to strings, like... $"Hello {name}! Welcome to our shop. You have {coins} gold coins to spend." see how nice that reads?

Eve.OP•6mo ago

yes okay so now it returns them all together oh it works

Eve.OP•6mo ago

Pobiega•6mo ago

public static void Main()
{
    Console.WriteLine("Enter a word:");
    var word = Console.ReadLine()!;

    var flipped = FlipLetters(word);

    Console.WriteLine(flipped);
}

public static void Main()
{
    Console.WriteLine("Enter a word:");
    var word = Console.ReadLine()!;

    var flipped = FlipLetters(word);

    Console.WriteLine(flipped);
}

Eve.OP•6mo ago

which bit is not needed

Pobiega•6mo ago

this is what I did

Eve.OP•6mo ago

oh okay yay thank you

Pobiega•6mo ago

but yeah, you see how similar it is

Eve.OP•6mo ago

you've helped me more than my teachers

Pobiega•6mo ago

sadly, that is often the case

Eve.OP•6mo ago

well thank you anyway can i add you so i can message you directly fine if not

Pobiega•6mo ago

I don't help over DMs, just make a thread 🙂

Eve.OP•6mo ago

okay :)

Pobiega•6mo ago

you can ping me inside that thread thou if you want

Eve.OP•6mo ago

okay will do thank you again

Pobiega•6mo ago

this way, other people can read the thread and learn, or correct me if I say something wrong etc its better for everyone 🙂

Eve.OP•6mo ago

very true

Pobiega•6mo ago

if you are "done" here, type /close to mark the thread as answered

Eve.OP•6mo ago

oki doki

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✅ help. i'm trying to make the last letter the first letter and vice versa