Can you use Enum for Double variables?

Question

I have created a class for handling Unit Conversion in C#. It is not working as it should only returning strings.

Here is the class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace RestaurantManagementSystem
{
    class unitHandler
    {
        public enum Units
        {
            Grams = 1,
            KiloGrams = 0.001,
            Milligram = 1000,
            Pounds = 0.00220462,
            Ounces = 0.035274,
            Tonnes = 0.000001,

            Litres = 1,
            Millilitres = 1000,
            Cups = 4.22675,
            FluidOunces = 33.814,
            TeaSpoon = 202.884,
            TableSpoon = 67.628,
            CubicFeet = 0.0353147,
            CubicInch = 61.0237,
            CubicCentimetres = 0.0001,
            CubicMetres = 0.001

        }

        public double Convert_Value(Units from, Units to, double quantity)
        {
            double converted_quantity = 0;

            double fromValue = quantity * Convert.ToDouble(from.ToString());

            converted_quantity = fromValue * Convert.ToDouble(to.ToString());

            return converted_quantity;
        }
    }
}

I would somehow want the enum type to contain the double values of conversion factors of each unit then use them for conversion and returning the converted quantity.

No, but you can interpret integers are fixed point numbers. – leppie Feb 07 '13 at 05:24 — leppie, Feb 07 '13 at 05:24

Adil · Accepted Answer · 2013-02-07T05:47:14.527

23

No, The default type for enum is int or long and you could not use fractional numbers with it. You can use a struct or class intead of enum for double

public struct Units
{
        public const double Grams = 1;
        public const double KiloGrams = 0.001;
        public const double Milligram = 1000;
        public const double Pounds = 0.00220462;
        public const double Ounces = 0.035274;
        public const double Tonnes = 0.000001;
        // Add Remaining units / values
}

And use it like

double d = Units.KiloGrams;

edited Feb 07 '13 at 05:47

answered Feb 07 '13 at 05:23

Adil

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This code snippet is very confusing... (after edit, it still makes no sense!) – leppie Feb 07 '13 at 05:26
6

At least use a static class with constants. – Dmitry S. Feb 07 '13 at 05:28

score 5 · Answer 2 · answered Feb 07 '13 at 05:23

5

Nope:

I tried giving this to Visual Studio:

public enum Test : double
{
    Hello, World
}

And it said:

Type byte, sbyte, short, ushort, int, uint, long, or ulong expected

answered Feb 07 '13 at 05:23

Carson Myers

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score 3 · Answer 3 · answered Feb 07 '13 at 05:24

3

You can't use float/double with enums. You may have to define constants.

public const double KiloGrams = 0.001;

answered Feb 07 '13 at 05:24

Habib

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score 3 · Answer 4 · answered Feb 07 '13 at 05:52

Sorry, can't be done. Enums are strictly integers/bytes. Really, they are supposed to be their own type.

You can try:

enum Units() {
    Grams ,
    KiloGrams ,
    Milligram 
}

public function GetUnitsFloatValue(Units unit) : float
{
    switch (unit)
    {
        case Units.Grams :
            return 1;
        case Units.KiloGrams :
            return 0.001;
        case Units.MilliGrams:
            return 1000;           
    }

    //unhandled unit?
    return 0;
}

score 1 · Answer 5 · answered Feb 07 '13 at 05:26

You can convert a double to a long using the BitConverter.DoubleToInt64Bits(double) method before hand and hardcode them into an enum with the backing long type. Then you would have to convert the enum value back to a double.

It is probably more trouble than it is worth.

score 0 · Answer 6 · answered Feb 07 '13 at 05:23

0

You cant use enum with doubles. You can only use it with int and long

answered Feb 07 '13 at 05:23

John Gathogo

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Can you use Enum for Double variables?

6 Answers6

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