Best way to check multiple boolean conditions in C# if statements

Question

I have 3 booleans on my code (C#) and an int32 property that depends on what booleans are true and false. Whats the best way to accomplish this in another way than if statements like:

if(a && b && !c)
   d = 1;
if(a && !b && !c)
   d = 2;
//etc.. ect...

EDIT: The 3 booleans must have every combination possible to set the int32 value.

EDIT 2: The value of "d" can be the same for two different boolean comparations.

Answer 1

You could use a Karnaugh map to reduce your equations and have fewer ifs.

https://en.wikipedia.org/wiki/Karnaugh_map

Answer 2

It is better to capture the intent of the operation instead of explicitly check the boolean values.

For example:

public void Check()
{
   if (HasOrdered())
   {
      // do logic
   }
}

private bool HasOrdered()
{
    return a && !b && !c;
}

private bool HasBooked()
{
    return a && b && !c;
}

Answer 3

I think what your doing now is perfectly fine and any other solutions would be down to preference.

My preference, where it applies would be to separate the checks out if possible.

 if (!a)
    return;
 if (!b)
    return;
 if (!c)
    return;

This would be useful in the event that you need to check certain prereqs before issuing a function, like if the user has logged in, if a parameter exists and is in the right context, along with other items.

Like i said this might not apply but i just wanted to voice my opinion