double float cast

[xavstone]

Hi all,

Can anyone tell me why im getting the error : " Cannot implicitly convert type 'double' to 'float'. An explicit conversion exists (are you missing a cast?) "? The compiler is highlighting the 1.0f but thats a float and i already declared magSq a float so im guessing its something to do with the sqrt method....? Im sure this is something simple but new to c# so please help guys!!! Thanks in advance as always for your help with this. Ben.

public void normalize()
{
float magSq = x * x + y * y + z * z;
if (magSq > 0.0f)//check for divide by zero and zero vectors
{
float oneOverMag = 1.0f / System.Math.Sqrt(magSq);
x *= oneOverMag;
y *= oneOverMag;
z *= oneOverMag;
}
}

 

[cappmgr]

You're right Sqrt returns a double.
float oneOverMag = 1.0f / (float)System.Math.Sqrt(magSq);

Marty

 

[xavstone]

Its impossible to cast a double to a float in c#, yes? Is there a workaround for this?

 

[cappmgr]

1.0f / System.Math.Sqrt(magSq);
returns a double, a float divided by a double returns a double.
the (float) before your Sqrt operation coverts the return value of Sqrt which is a double to a float.

Marty

 

[xavstone]

works...thanks, ben