C#•2y ago

I don't understand what this is asking for at all (sry for bad title) [Answered]

Create a Sieve class with a public bool IsGood(int number) method. This class needs a constructor with a delegate parameter that can be invoked later within the IsGood method. Hint: You can make your own delegate type or use Func<int, bool>

Create a Sieve class with a public bool IsGood(int number) method. This class needs a constructor with a delegate parameter that can be invoked later within the IsGood method. Hint: You can make your own delegate type or use Func<int, bool>

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Unknown User•2y ago

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BigggMoustache•2y ago

okay I will

Unknown User•2y ago

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BigggMoustache•2y ago

okay brb

Unknown User•2y ago

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BigggMoustache•2y ago

yeah that part confused me a lot

Unknown User•2y ago

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BigggMoustache•2y ago

i get putting delegate in the param

MODiX•2y ago

tebeco#0205

what does your code look like

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<@!689473681302224947> from #I don't understand what this is asking for at all (sry for bad title) (click here)

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Unknown User•2y ago

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BigggMoustache•2y ago

lol okay i am :]

class Sieve
{
    public bool IsGood(int number)
    {
        return true;
    }
    public Sieve(int number, SieveDelegate operation)
    {

    }
}

class Sieve
{
    public bool IsGood(int number)
    {
        return true;
    }
    public Sieve(int number, SieveDelegate operation)
    {

    }
}

so I think I get it more now

Unknown User•2y ago

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BigggMoustache•2y ago

Console.WriteLine("Which filter: Even, positive, or x10?");
string filterChoice = Console.ReadLine();
//if (filterChoice == "even")

bool Even(int number) => number % 2 == 0;
bool Positive(int number) => number > -1;
bool Mult10(int number) => number % 10 == 0;

class Sieve
{
    public bool IsGood(int number)
    {
        return true;
    }
    public Sieve(int number, SieveDelegate operation)
    {

    }
}

public delegate int SieveDelegate(int number);

Console.WriteLine("Which filter: Even, positive, or x10?");
string filterChoice = Console.ReadLine();
//if (filterChoice == "even")

bool Even(int number) => number % 2 == 0;
bool Positive(int number) => number > -1;
bool Mult10(int number) => number % 10 == 0;

class Sieve
{
    public bool IsGood(int number)
    {
        return true;
    }
    public Sieve(int number, SieveDelegate operation)
    {

    }
}

public delegate int SieveDelegate(int number);

Unknown User•2y ago

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BigggMoustache•2y ago

lol

Unknown User•2y ago

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BigggMoustache•2y ago

oh yeah

Unknown User•2y ago

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BigggMoustache•2y ago

so just a Func<int> func

Unknown User•2y ago

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BigggMoustache•2y ago

no and I'm reading sorry. so the int is the paramater and the bool is what it returns?

Unknown User•2y ago

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BigggMoustache•2y ago

it will only be for the better Func<int, bool>

Unknown User•2y ago

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BigggMoustache•2y ago

but that's so much more confusing to me lol

Unknown User•2y ago

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MODiX•2y ago

tebeco#0205

class Sieve
{
    public bool IsGood(int number)
    {
        return true;
    }
    public Sieve(int number, SieveDelegate operation)
    {

    }
}

class Sieve
{
    public bool IsGood(int number)
    {
        return true;
    }
    public Sieve(int number, SieveDelegate operation)
    {

    }
}

Quoted by

<@!689473681302224947> from #I don't understand what this is asking for at all (sry for bad title) (click here)

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Unknown User•2y ago

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BigggMoustache•2y ago

okay

Unknown User•2y ago

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BigggMoustache•2y ago

lol okay i didn't know ctor came first i think I need to read the delegate information again brb I'm just so confused man I'm sorry idk why but none of this makes sense to me. the chapter isntruction used a user made delegate, I have no idea what to do with this func thing and brb again, i'm sick 😭 Objectives: • Create a Sieve class with a public bool IsGood(int number) method. This class needs a constructor with a delegate parameter that can be invoked later within the IsGood method. Hint: You can make your own delegate type or use Func<int, bool>. • Define methods with an int parameter and a bool return type for the following: (1) returns true for even numbers, (2) returns true for positive numbers, and (3) returns true for multiples of 10. • Create a program that asks the user to pick one of those three filters, constructs a new Sieve instance by passing in one of those methods as a parameter, and then ask the user to enter numbers repeatedly, displaying whether the number is good or bad depending on the filter in use. • Answer this question: Describe how you could have also solved this problem with inheritance and polymorphism. Which solution seems more straightforward to you, and why? here's the whole of the exercise just so we have the same frame of reference. i feel like I'm wasting your time my man. Sorry.

Unknown User•2y ago

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BigggMoustache•2y ago

public class Sieve
{
    public Sieve(int number, Func<int, bool> func)
    {

    }
    public bool IsGood(int number)
    {
        return true;
    }

public class Sieve
{
    public Sieve(int number, Func<int, bool> func)
    {

    }
    public bool IsGood(int number)
    {
        return true;
    }

I did what you asked I thought

Unknown User•2y ago

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BigggMoustache•2y ago

lol okay

Unknown User•2y ago

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BigggMoustache•2y ago

passing a method like a variable pretty much?

Unknown User•2y ago

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BigggMoustache•2y ago

it's just calling it right? delegate.Invoke()

Unknown User•2y ago

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BigggMoustache•2y ago

lol okay

Unknown User•2y ago

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BigggMoustache•2y ago

right

Unknown User•2y ago

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BigggMoustache•2y ago

    public Sieve(int number, Func<int, bool> func)
    {
        func.Invoke(number);
    }

    public Sieve(int number, Func<int, bool> func)
    {
        func.Invoke(number);
    }

like that? I only used ctor for assigning properties before, so I didn't know any of this made sense at all

Unknown User•2y ago

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MODiX•2y ago

tebeco#0205

Func<......> foo;
foo()

Func<......> foo;
foo()

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BigggMoustache•2y ago

lol okay

BigggMoustache•2y ago

Unknown User•2y ago

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BigggMoustache•2y ago

bool Even(int number) => number % 2 == 0;
bool Positive(int number) => number > -1;
bool Mult10(int number) => number % 10 == 0;

Sieve sieve = new Sieve(4, Even);

public class Sieve
{
    public Sieve(int number, Func<int, bool> func)
    {
        func(number);
    }
    public bool IsGood(int number)
    {
        return true;
    }
}

bool Even(int number) => number % 2 == 0;
bool Positive(int number) => number > -1;
bool Mult10(int number) => number % 10 == 0;

Sieve sieve = new Sieve(4, Even);

public class Sieve
{
    public Sieve(int number, Func<int, bool> func)
    {
        func(number);
    }
    public bool IsGood(int number)
    {
        return true;
    }
}

so this is using the delegate now right?

Unknown User•2y ago

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BigggMoustache•2y ago

but how to access? do i set property to = func?

Unknown User•2y ago

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BigggMoustache•2y ago

I am sorry I don't know variable? lol

Unknown User•2y ago

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BigggMoustache•2y ago

LOL

Unknown User•2y ago

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BigggMoustache•2y ago

i like it tyvm sorry for being dumb I am genuinely trying to learn, coding is hard.

Unknown User•2y ago

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BigggMoustache•2y ago

Unknown User•2y ago

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BigggMoustache•2y ago

i want a job doing this, i have to learn xD

Unknown User•2y ago

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BigggMoustache•2y ago

yes

Unknown User•2y ago

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BigggMoustache•2y ago

i honestly don't know bud

Unknown User•2y ago

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BigggMoustache•2y ago

idk what a field is lol i'll search real quick !field haha was hoping holy shit okay tyvm field is nice I'll have to remember that

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(int number, Func<int, bool> func)
    {
        _function = func;
    }
    public bool IsGood(int number)
    {
        return _function(number);
    }
}

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(int number, Func<int, bool> func)
    {
        _function = func;
    }
    public bool IsGood(int number)
    {
        return _function(number);
    }
}

What I am understanding is like.. adding 2+ 2 It's not the same as stacking 2 block + 2 block, or cutting 2" wood and 2" wood

Unknown User•2y ago

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BigggMoustache•2y ago

so like I learn what "delegate" is, but not how it is used. Just like I can learn what 2 + 2 is, but not how it's used I get very frustrated feeling like I'm not learning anything because of this lol okay so I understand now, I think, tyvm

Unknown User•2y ago

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BigggMoustache•2y ago

ye it's a bout separation right

Unknown User•2y ago

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BigggMoustache•2y ago

right right

Unknown User•2y ago

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BigggMoustache•2y ago

i don't understand that lol

Unknown User•2y ago

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BigggMoustache•2y ago

so you don't even need to write out your delegate functions?

Unknown User•2y ago

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BigggMoustache•2y ago

if i have func<int, bool> in ctor I can just slap things in the param?

Unknown User•2y ago

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BigggMoustache•2y ago

wow nice

Unknown User•2y ago

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MODiX•2y ago

tebeco#0205

REPL Result: Success

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(int number, Func<int, bool> func)
    {
        _function = func;
    }
    public bool IsGood(int number)
    {
        return _function(number);
    }
}

var one = new Sieve(1, i => i > 100);
one.IsGood(34252345)

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(int number, Func<int, bool> func)
    {
        _function = func;
    }
    public bool IsGood(int number)
    {
        return _function(number);
    }
}

var one = new Sieve(1, i => i > 100);
one.IsGood(34252345)

Result: bool

True

True

Compile: 613.693ms | Execution: 60.531ms | React with ❌ to remove this embed.

BigggMoustache•2y ago

lol

Unknown User•2y ago

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BigggMoustache•2y ago

from before when I was making delegate i didn't understand Func<in, out> so was taking number in there

Unknown User•2y ago

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BigggMoustache•2y ago

you are correct lol I did xD

Unknown User•2y ago

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BigggMoustache•2y ago

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(Func<int, bool> func)
    {
        _function = func;
    }
    public bool IsGood(int number)
    {
        return _function(number);
    }
}

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(Func<int, bool> func)
    {
        _function = func;
    }
    public bool IsGood(int number)
    {
        return _function(number);
    }
}

Unknown User•2y ago

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BigggMoustache•2y ago

lint = fuzz in pocket

Unknown User•2y ago

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BigggMoustache•2y ago

lol member?

Unknown User•2y ago

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BigggMoustache•2y ago

okay

Unknown User•2y ago

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BigggMoustache•2y ago

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(Func<int, bool> func)
    {
        _function = func;
    }

    public bool IsGood(int number)
    {
        return _function(number);
    }
}

public class Sieve
{
    private Func<int, bool> _function;
    public Sieve(Func<int, bool> func)
    {
        _function = func;
    }

    public bool IsGood(int number)
    {
        return _function(number);
    }
}

Unknown User•2y ago

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BigggMoustache•2y ago

public class Sieve
{
    private Func<int, bool> _isGood;

    public Sieve(Func<int, bool> isGood)
    {
        _isGood = isGood;
    }

    public bool IsGood(int number)
    {
        return _isGood(number);
    }
}

public class Sieve
{
    private Func<int, bool> _isGood;

    public Sieve(Func<int, bool> isGood)
    {
        _isGood = isGood;
    }

    public bool IsGood(int number)
    {
        return _isGood(number);
    }
}

ya that was bad naming. ty for reminding.

Unknown User•2y ago

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BigggMoustache•2y ago

yeah duh ty

Unknown User•2y ago

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BigggMoustache•2y ago

Unknown User•2y ago

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BigggMoustache•2y ago

oh okay

Unknown User•2y ago

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BigggMoustache•2y ago

i did it lol honestlyu lambda still confuse me so i don't use a lot

MODiX•2y ago

tebeco#0205

(send code as you edit)

Quoted by

<@!689473681302224947> from #I don't understand what this is asking for at all (sry for bad title) (click here)

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Unknown User•2y ago

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BigggMoustache•2y ago

public class Sieve
{
    private Func<int, bool> _numChecker;

    public Sieve(Func<int, bool> numChecker) => _numChecker = numChecker;

    public bool IsGood(int number) => _numChecker(number);
}

public class Sieve
{
    private Func<int, bool> _numChecker;

    public Sieve(Func<int, bool> numChecker) => _numChecker = numChecker;

    public bool IsGood(int number) => _numChecker(number);
}

Unknown User•2y ago

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BigggMoustache•2y ago

yo dude people like you make this place worth being in

Unknown User•2y ago

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BigggMoustache•2y ago

thank yo uso much. oh it's not?

Unknown User•2y ago

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BigggMoustache•2y ago

oh okay

Unknown User•2y ago

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BigggMoustache•2y ago

I'll have to read about it xD

bool Even(int number) => number % 2 == 0;
bool Positive(int number) => number > -1;
bool Mult10(int number) => number % 10 == 0;

Sieve sieve = AssignSieve();

Sieve AssignSieve()
{
    while(true)
    {
        Console.WriteLine("Which filter: Even, positive, or Mult10?");
        string filterChoice = Console.ReadLine();

        if (filterChoice == "even") return new Sieve(Even);
        if (filterChoice == "positive") return new Sieve(Positive);
        if (filterChoice == "mult10") return new Sieve(Mult10);
        else
        {
            Console.WriteLine("Not a valid input");
        }
    }
}


while(true)
{
    Console.Write("Enter a number: ");
    string ?input = Console.ReadLine();
    Console.WriteLine($"Can input go through sieve {sieve}? {sieve.IsGood(Int32.Parse(input))}");
    
}

public class Sieve
{
    private Func<int, bool> _numChecker;

    public Sieve(Func<int, bool> numChecker) => _numChecker = numChecker;

    public bool IsGood(int number) => _numChecker(number);
}

bool Even(int number) => number % 2 == 0;
bool Positive(int number) => number > -1;
bool Mult10(int number) => number % 10 == 0;

Sieve sieve = AssignSieve();

Sieve AssignSieve()
{
    while(true)
    {
        Console.WriteLine("Which filter: Even, positive, or Mult10?");
        string filterChoice = Console.ReadLine();

        if (filterChoice == "even") return new Sieve(Even);
        if (filterChoice == "positive") return new Sieve(Positive);
        if (filterChoice == "mult10") return new Sieve(Mult10);
        else
        {
            Console.WriteLine("Not a valid input");
        }
    }
}


while(true)
{
    Console.Write("Enter a number: ");
    string ?input = Console.ReadLine();
    Console.WriteLine($"Can input go through sieve {sieve}? {sieve.IsGood(Int32.Parse(input))}");
    
}

public class Sieve
{
    private Func<int, bool> _numChecker;

    public Sieve(Func<int, bool> numChecker) => _numChecker = numChecker;

    public bool IsGood(int number) => _numChecker(number);
}

you point out other bad things?

Unknown User•2y ago

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BigggMoustache•2y ago

I thought about switch expression, I'l lrewrite like that thanks. If I take new out it throws error "cannot be used like a method" Oh I get what you're saying. so you would make a sieveEven, sievePositive etc and just reassign them to sieve in the switch

Unknown User•2y ago

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BigggMoustache•2y ago

i don't know what state specific means

Unknown User•2y ago

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BigggMoustache•2y ago

okay

Unknown User•2y ago

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BigggMoustache•2y ago

okay

Unknown User•2y ago

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BigggMoustache•2y ago

right

Unknown User•2y ago

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BigggMoustache•2y ago

Thanks. I get confused a lot because I remember "everything public = code smell" but things need to be public so much because I'm bad at writing code xD so sometimes I don't think about it because idk, I feel like I'm doing things wrong otherwise.

Unknown User•2y ago

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BigggMoustache•2y ago

attributes get ignored because i'm bad xD ty for pointing out though, I will try and remember that

Sieve sieve;
Sieve sieveEven = new Sieve(number => number % 2 == 0);
Sieve sievePositive = new Sieve(number => number > -1);
Sieve sieveMult10 = new Sieve(number => number % 10 == 0);

AssignSieve();
Sieve AssignSieve()
{
    while (true)
    {
        Console.WriteLine("Which filter: Even, positive, or Mult10?");
        string filterChoice = Console.ReadLine();
        sieve = filterChoice switch
        {
            "even" => sieveEven,
            "positive" => sievePositive,
            "mult10" => sieveMult10
            _ => AssignSieve()
        };
        return sieve;
    }
}


while(true)
{
    Console.Write("Enter a number: ");
    string ?input = Console.ReadLine();
    Console.WriteLine($"Can input go through sieve? {sieve.IsGood(Int32.Parse(input))}");
    
}

public class Sieve
{
    public readonly Func<int, bool> _numChecker;

    public Sieve(Func<int, bool> numChecker) => _numChecker = numChecker;

    public bool IsGood(int number) => _numChecker(number);
}

Sieve sieve;
Sieve sieveEven = new Sieve(number => number % 2 == 0);
Sieve sievePositive = new Sieve(number => number > -1);
Sieve sieveMult10 = new Sieve(number => number % 10 == 0);

AssignSieve();
Sieve AssignSieve()
{
    while (true)
    {
        Console.WriteLine("Which filter: Even, positive, or Mult10?");
        string filterChoice = Console.ReadLine();
        sieve = filterChoice switch
        {
            "even" => sieveEven,
            "positive" => sievePositive,
            "mult10" => sieveMult10
            _ => AssignSieve()
        };
        return sieve;
    }
}


while(true)
{
    Console.Write("Enter a number: ");
    string ?input = Console.ReadLine();
    Console.WriteLine($"Can input go through sieve? {sieve.IsGood(Int32.Parse(input))}");
    
}

public class Sieve
{
    public readonly Func<int, bool> _numChecker;

    public Sieve(Func<int, bool> numChecker) => _numChecker = numChecker;

    public bool IsGood(int number) => _numChecker(number);
}

this is what I have now why did you say return null or something? I have to get a Sieve assigned to continue, so what's wrong with just calling itself again to repeat until a valid return?

Unknown User•2y ago

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BigggMoustache•2y ago

That was what I was thinking. Thanks. "cannot implicitly convert bool to type Sieve" when making that change. Gonna look at it for a minute. Oh duh I fixed it. Thanks a ton for the feedback. :]

Accord•2y ago

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I don't understand what this is asking for at all (sry for bad title) [Answered]