C#•9mo ago

❔ Factory Design method pattern

Hello! Can some one help me with Factory Method, I am working on RPN Calculator project and need to use this design method but I don't understand how it works and how to implement it. ChatGPT gave me a solution but i want to learn how it works.

public interface IOperator
{
    public double Calc(double x, double y);
}



public class Add : IOperator
{ 
    public double Calc(double x, double y) => x+ y;
    
}


//not sure how to do it
public class Div : IOperator
{

    public double Calc(double x, double y)
    {
        try
        {
            return x / y;
        }
        catch (Exception ex)
        {
            // make it in the program.cs that if this function gives 0 => to give "DivideByZeroException" 
            //Or find another solution

            throw new DivideByZeroException("Deiasda");
            return 0;
        }
    }
}
// not sure how to do it because the type is return double and not void 
public class Mod : IOperator
{
    //need to get modified, because of if u get 4 0 % the program should 

    public double Calc (double x, double y)
    {
        return x % y;
    }
}

public class Multi : IOperator
{
    public double Calc (double x, double y)=> x * y;
}

public class Sub : IOperator
{
    public double Calc (double x, double y)=> x - y;
}

public interface IOperator
{
    public double Calc(double x, double y);
}



public class Add : IOperator
{ 
    public double Calc(double x, double y) => x+ y;
    
}


//not sure how to do it
public class Div : IOperator
{

    public double Calc(double x, double y)
    {
        try
        {
            return x / y;
        }
        catch (Exception ex)
        {
            // make it in the program.cs that if this function gives 0 => to give "DivideByZeroException" 
            //Or find another solution

            throw new DivideByZeroException("Deiasda");
            return 0;
        }
    }
}
// not sure how to do it because the type is return double and not void 
public class Mod : IOperator
{
    //need to get modified, because of if u get 4 0 % the program should 

    public double Calc (double x, double y)
    {
        return x % y;
    }
}

public class Multi : IOperator
{
    public double Calc (double x, double y)=> x * y;
}

public class Sub : IOperator
{
    public double Calc (double x, double y)=> x - y;
}

5 Replies

phaseshift•9mo ago

I don't see factory anywhere.

// not sure how to do it because the type is return double and not void

I don't know what 'it' is - your code seems ok Div:

if (y == 0)
  throw new DivideByZeroException("Deiasda");

return x / y;

if (y == 0)
  throw new DivideByZeroException("Deiasda");

return x / y;

George•9mo ago

yeah I don't know how to implement factory to my code

phaseshift•9mo ago

The factory method would be,

IOperator MakeOperator(string name)
{
  if (name == "sub") {
    return new Sub();
  else if ... {
  }
}

IOperator MakeOperator(string name)
{
  if (name == "sub") {
    return new Sub();
  else if ... {
  }
}

switch block or switch expression would be 'cleaner'. Also not sure what you're using for the key - I just used string name as an example

George•9mo ago

yes thanks for your help!!

Accord•9mo 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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❔ Factory Design method pattern