C syntax question

The Arducopter code is C++ not C.

f = float qualifier

float is a 32 bits data type with 23 bits for mantissa 8 bits for exposant and 1 bit for sign.

By default, if you type a floating point value into C++ it’s typed as a double. Consequently, if you do something like this:

float fValue = 4.53; // 4.53 is a double

You’re assigning a double to a float, which loses precision, and the compiler will probably complain.

Putting an “f” after the value means that you intend that value to be a float, not a double.

float fValue = 4.53f; // 4.53 is a float

Geoffrey Thomas June 8, 2011 at 4:30pm

It forces 1000 to be of type float
Developer
Olivier ADLER June 8, 2011 at 4:02pm
The Arducopter code is C++ not C.

f = float qualifier

float is a 32 bits data type with 23 bits for mantissa 8 bits for exposant and 1 bit for sign.

By default, if you type a floating point value into C++ it’s typed as a double. Consequently, if you do something like this:
```
float fValue = 4.53; // 4.53 is a double
```
You’re assigning a double to a float, which loses precision, and the compiler will probably complain.

Putting an “f” after the value means that you intend that value to be a float, not a double.
```
float fValue = 4.53f; // 4.53 is a float
```
3D Robotics

Chris Anderson June 8, 2011 at 3:53pm

It means it's a float. It's C++ syntax.

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