C#•2y ago

❔ 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;
        }

        
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

43 Replies

Anton•2y ago

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

krycaOP•2y ago

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

Anton•2y ago

oh you don't, alright well probably just mark a vowel whener you find one with another bool[] or BitArray or just by marking bits on an int

Aimbot•2y ago

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

Anton•2y ago

or a HashSet<char>, or a List<char> there are a bunch of ways, the int with marking bits is probably the fastest

krycaOP•2y ago

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

Anton•2y ago

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 with an int

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

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;
}

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

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

krycaOP•2y ago

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

Anton•2y ago

np note that the first one is undefined behavior if the length of balse is more than 32 be sure to use bit operations carefully

krycaOP•2y ago

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 ?

Anton•2y ago

split by new line characters, swap the needed lines, join the text back but if you're doing text editing software, you probably should store it split by linea internally that would make sense either way

krycaOP•2y ago

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

Anton•2y ago

I think

krycaOP•2y ago

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

Anton•2y ago

the same way you swap values of two variables, swap the values of two positions in the array oh hold on you mean you want to move the rest below them

krycaOP•2y ago

say these are the lines 1 yes 2yup 3 maybe 4 no this should be the output: 3 maybe 1 yes 2yup 4 no

Anton•2y ago

1 2 3 4 3 4 1 2 let's say these are the lines right?

krycaOP•2y ago

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

Anton•2y ago

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

krycaOP•2y ago

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

Anton•2y ago

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

krycaOP•2y ago

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 ? or is it easier in c# ?

Anton•2y ago

double for?

krycaOP•2y ago

two 'for' cycles

Anton•2y ago

you only need a single for to move the lines one up you could also just use a list

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

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 this moves twice as many items on average

krycaOP•2y ago

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

Anton•2y ago

ah no, three times as much

krycaOP•2y ago

oh wait no

Anton•2y ago

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

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

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

artya•2y ago

LINQ:

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

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

krycaOP•2y ago

Aight, thanks a lot for the help :D

Anton•2y ago

just do a ToHashSet() and keep it a set whats the point of converting it to a string if you've already got a set

artya•2y ago

hmm true

Anton•2y ago

(distinct makes a set internally)

ero•2y ago

input.ToLower()
.ToHashSet()
.Intersect(vowels) // only need the lowercase ones
.Count()

input.ToLower()
.ToHashSet()
.Intersect(vowels) // only need the lowercase ones
.Count()

krycaOP•2y ago

krycaOP•2y ago

n is 5, my text file has 7 lines

ero•2y ago

error is pretty clear, no? i mean evidently it does not

krycaOP•2y ago

ye nvm mixed up the names of the text files...

softmek•2y ago

string inputString; inputString = Console.ReadLine(); int vowelCount = 0; foreach (char c in inputString) { if (c == 'a' c == 'e' c == 'i' c == 'o' c == 'u') { vowelCount++; } } Console.WriteLine(vowelCount);

Aimbot•2y ago

@softmek It's neither concise nor fast solution and it counts duplicates too You can immediately get the count without storing the score in the string

Accord•2y 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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❔ How do i count how many different vowels are in a string?