What's the mean of "f" in this Code

Using Arduino Programming Questions
1

Hi, i found this code on the internet:

#define Kp 2.0f			// proportional gain governs rate of convergence to accelerometer/magnetometer
#define Ki 0.005f		// integral gain governs rate of convergence of gyroscope biases
#define halfT 0.5f		// half the sample period

Wahat the mean of "f" at 2.0f, 0.005f, and 0.5f?

2

Possibly "float" but it depends how the definitions are used later on. In this code it's just definition for the precompiler.

3

pylon:
Possibly "float" but it depends how the definitions are used later on. In this code it's just definition for the precompiler.

How if i deleted "f" and just use the number? I found many definition like this, for example:

#define GRAVITY 16384.0f
#define SCALE_PID_PARAMS 1000.0f

But i still confused what is the mean of "f"..

4

This has a good answer, there are links to relevant info:

5

pYro_65:
This has a good answer, there are links to relevant info:
c++ - Purpose of a ".f" appended to a number? - Stack Overflow

Great..
Thank You..

6

No worries, remember stack overflow, it has a lot of great non-Arduino answers ( arduino stuff too ).