如果在C＃中返回语句

Question

I am overriding a virtual method and I need to return a value depending on a bool expression.

  public override float Q()
    {
        return (float)Math.Sqrt(2 * A* B / C);
    }

I need to return a local member (call it D) for Q() if the calculated value shown above is less than D. I tried using regular if statements, but it won't return a value unless it's returned outside the if statement. Any help would be appreciated.

Answer 1

How about skipping the if altogether:

return Math.Max(D, Math.Sqrt (2*A*B/C));

or with ternary operator

return  Math.Sqrt (2*A*B/C) < D ? D :  Math.Sqrt (2*A*B/C); // too verbose but you get the idea

Answer 2

i would think this would work

public override float Q(){
    var returnValue = (float)Math.Sqrt(2 * A * B / C);

    if (returnValue < D){
        return D;
    }

    return returnValue;
}

EDIT :
or you can clean it up to this

public override float Q(){
    var returnValue = (float)Math.Sqrt(2 * A * B / C);

    return returnValue < D ? D : returnValue;
}

Answer 3

public override float Q()
{
    var result = (float)Math.Sqrt(2 * A* B / C);
    return result < D ? D : result;
}

Answer 4

Unless this is a trick question, since D is local to the class, the code should look like this:

public override float Q()
{
    var result = (float)Math.Sqrt(2 * A* B / C);
    return result < D ? D : result;
}

but note that D needs to be a float or cast to a float on the return if it's not. Further, if D isn't a float you may want to just do something like this because its type may not be implicitly convertable:

public override float Q()
{
    var d = (float)D;
    var result = (float)Math.Sqrt(2 * A* B / C);
    return result < d ? d : result;
}

Answer 5

Something like this:

public override float Q(){
    var r = (float)Math.Sqrt(2 * A * B / C);

    if (r < D){
        r = D;
    }

    return r;
}