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;
us         


        

Answer 1

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

Answer 2

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

Answer 3

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.

Answer 4

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;

Answer 5

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

public const double KiloGrams = 0.001;

Answer 6

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;
}