Direct X vector question

[Docido]

I recently got a new book on programming with direct x. While I was reading through the chapter about vectors, I found this line in the sample code, which creates a vector:

//Using constructor, D3DXVECTOR3 (FLOAT x, FLOAT y, FLOAT z)
D3DXVECTOR3 u(1.0f, 2.0f, 3.0f);

What I wanted to know is: What does the 'f' that goes with the values passed to the constructor mean?
(Forgive me if this is a noob question)

Thanks

[o1vk4iN6]

It's to signify the constant value as a Float rather than a double.

float a = 1.0; // truncation warning double to float
float b = 1.0f; // no warning

double c = 1.0; // no warning 

[Docido]

Ah, ok thanks a lot.