❔ How do i count how many different vowels are in a string? The only method i've come up with is to count how many vowels are in a string not accounting for duplicates. This is the code so far: static int DiffVowel(string e, char[] balse) { int z = 0; foreach (char c in e) { for (int i = 0; i < balse.Length; i++) { if (balse[i] == c) { z++; } } } return z; } char[] balse = { 'a', 'A', 'e', 'E', 'i', 'I', 'o', 'O', 'u', 'U' }; Any help is appreciated

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Root Question Message

Kryca12/6/2022

❔ How do i count how many different vowels are in a string?

The only method i've come up with is to count how many vowels are in a string not accounting for duplicates.
This is the code so far:

        
static int DiffVowel(string e, char[] balse) 
        {
            int z = 0;
            foreach (char c in e) 
            {
                for (int i = 0; i < balse.Length; i++) 
                {
                    if (balse[i] == c) 
                    {
                        z++;
                    }
                }
            }
            return z;
        }

char[] balse = { 'a', 'A', 'e', 'E', 'i', 'I', 'o', 'O', 'u', 'U' };
Any help is appreciated

AntonC12/6/2022

yeah seems good

AntonC12/6/2022

the best way would be to use Array.IndexOf or a binary search maybe

Kryca12/6/2022

Wouldn't my code count duplicates too? i only need to know the amount of unique vowels

AntonC12/6/2022

oh you don't, alright

AntonC12/6/2022

well probably just mark a vowel whener you find one

AntonC12/6/2022

with another bool[] or BitArray or just by marking bits on an int

Aimbot12/6/2022

Well you can use linq but I don't know if it's worth for you to learn it rn

AntonC12/6/2022

or a HashSet<char>, or a List<char>

AntonC12/6/2022

there are a bunch of ways, the int with marking bits is probably the fastest

Kryca12/6/2022

Could you type an example? haven't really dealt with text editing that much

AntonC12/6/2022

so like when you find a vowel at position N, set the bit at position N in that int. If it's already set, don't increment the count

AntonC12/6/2022

with an int

int seen = 0;
// ...
if (balse[i] == c
    && ((seen & (1 << i)) == 0))
{
    z++;
    seen |= 1 << i;
}

with a bit array

var seen = new BitArray(balse.Length);
// ..
if (balse[i] == c && !seen[i])
{
    z++;
    seen[i] = true;
}

same with bool[]

AntonC12/6/2022

it's a general thing, it has nothing to do with text editing in particular

Kryca12/6/2022

Just tried it out and it works, thanks a lot ;D

AntonC12/6/2022

note that the first one is undefined behavior if the length of balse is more than 32

AntonC12/6/2022

be sure to use bit operations carefully

Kryca12/6/2022

Another question then, say i have 3 lines of text, and i want to move the 2nd line all the way to the top, how should i approach this ?

AntonC12/6/2022

split by new line characters, swap the needed lines, join the text back

AntonC12/6/2022

but if you're doing text editing software, you probably should store it split by linea internally

AntonC12/6/2022

that would make sense either way

Kryca12/6/2022

i know how to split text into lines words etc, how do i move it to the top though

AntonC12/6/2022

I think

Kryca12/6/2022

all the lines asides from the one i want to move up should stay in the same position

AntonC12/6/2022

the same way you swap values of two variables, swap the values of two positions in the array

AntonC12/6/2022

oh hold on

AntonC12/6/2022

you mean you want to move the rest below them

Kryca12/6/2022

say these are the lines
1 yes
2yup
3 maybe
4 no

this should be the output:
3 maybe
1 yes
2yup
4 no

AntonC12/6/2022

1
2
3
4

3
4
1
2

let's say these are the lines

AntonC12/6/2022

right?

Kryca12/6/2022

pretty much instead of moving 2 i need to move 1 only

AntonC12/6/2022

yeah with a single line moving it's a bit simpler than moving a chunk

Kryca12/6/2022

its a weird task with a bit of limitations, but to put it simply, find the longest word in a text file, move that line that has the longest word to the top

AntonC12/6/2022

the idea is to remember the line you want to move, then move all the lines before it one up, then write it into the first postion

Kryca12/6/2022

okay so treat the lines of the text as an array and then simply make space for a line at the start with double for ?

Kryca12/6/2022

or is it easier in c# ?

AntonC12/6/2022

double for?

Kryca12/6/2022

two 'for' cycles

AntonC12/6/2022

you only need a single for

AntonC12/6/2022

to move the lines one up

AntonC12/6/2022

you could also just use a list

AntonC12/6/2022

var lines = List<string>();
// fill up the lines list
var longestIndex = FindIndexOfLongest(lines);
var longest = lines[longestIndex];
lines.RemoveAt(longestIndex);
lines.Insert(0, longest);

it does a bit more work than moving stuff manually tho

AntonC12/6/2022

this moves twice as many items on average

Kryca12/6/2022

would lines.ReadAllLines(filename); work to fill up the list?

AntonC12/6/2022

ah no, three times as much

Kryca12/6/2022

oh wait no

AntonC12/6/2022

 lines.AddRange(File.ReadAllLines(filename));

AntonC12/6/2022

but just move manually, it's like 4 lines of code

arttt12/6/2022

LINQ:

 
string uniqueVowels = new string(input.Where(c => vowels.Contains(c)).Distinct().ToArray());

Kryca12/6/2022

Aight, thanks a lot for the help :D

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