CODEWITHSUNDEEP
c#unity-game-enginetypes
JazzyGreen
JazzyGreen

Reputation: 339

C# converting type double to float

I'm new to C#, and I can't work out why I'm getting the following error on these lines of code.

"error CS0266: Cannot implicitly convert type 'double' to 'float'. An explicit conversion exists (are you missing a cast?)"

float rightEdgeOfFormation = (float) transform.position.x + (width * 0.5);
float leftEdgeOfFormation = (float) transform.position.x - (width * 0.5);

I thought writing (float) was the cast?

Thanks so much!

Upvotes: 0

Views: 18724

Answers (6)

Mike Nakis
Mike Nakis

Reputation: 61993

A type cast has the highest precedence of all other operations. Therefore, (float) transform.position.x is evaluated before + (width * 0.5). However, (width * 0.5) is a double expression, because the constant 0.5 is a double constant. (You should have used 0.5f if you wanted it to be float.) And when adding a float and a double, C# always "promotes" the float to double. So, the result of float + double is a double, which is then not assignable to a float.

To fix it, either put the entire expression in parentheses before casting to float, or make your 0.5 a float constant by writing it as 0.5f.

Upvotes: 5

Koderzzzz
Koderzzzz

Reputation: 869

Use the following

float rightEdgeOfFormation = Convert.ToSingle(transform.position.x + (width * 0.5));

float leftEdgeOfFormation = Convert.ToSingle(transform.position.x - (width * 0.5));

Upvotes: 0

Jamadan
Jamadan

Reputation: 2313

I think it's just your brackets. float rightEdgeOfFormation = (float) (transform.position.x + (width * 0.5));

Upvotes: 1

Wollmich
Wollmich

Reputation: 1646

float rightEdgeOfFormation = (float)transform.position.x + ((float)width * 0.5F);
float leftEdgeOfFormation = (float)transform.position.x - ((float)width * 0.5F);

See https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/float

Upvotes: 1

PaulF
PaulF

Reputation: 6773

Try :

float rightEdgeOfFormation = (float) (transform.position.x + (width * 0.5));
float leftEdgeOfFormation = (float) (transform.position.x - (width * 0.5));

you are just casting transform.position.x not the entire expression & something else in the expression is causing the calculation to be done as a double.

Upvotes: 3

Fiffe
Fiffe

Reputation: 1256

You're multiplying by 0.5, when you're using floats you need to put f at their end.

This will work:

float rightEdgeOfFormation = transform.position.x + (width * 0.5f);
float leftEdgeOfFormation = transform.position.x - (width * 0.5f);

Upvotes: 4

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