PROS First Time Users Guide¶
The most important characteristic of PROS to note when getting started is that PROS is just standard C or C++ programming. Anything that works in standard C/C++ will work as a part of a PROS project, and similarly the errors given for code that doesn’t work will match errors given for any similar C/C++ code. Learning C/C++ is essential for using PROS.
I’ve never used PROS or written C/C++ code before, how do I start?¶
If you have not used PROS or done non-VEX C/C++ code development before, we recommend that you check out C tutorials on the following topics:
- Functions. C is a language that heavily emphasizes functions, and knowing how they work is essential to using PROS. The PROS API is a set of functions, so any time that you want to interact with a sensor or motor, you’re using functions.
The PROS template (the set of files automatically created when you
start a PROS project) contains a couple of header files, and it’s
recommended that you make additional header files as you develop your
code. Header files contain the declarations for functions and global
variables (among other things), which is why the PROS API
can be found in
include/pros/api.h. Knowing what code should go in a header file (
.hpp) or a source file (
.cpp) can be difficult to determine at first, but it is a very useful skill to learn.
At some point when developing PROS code, you will likely want to get
some feedback on what the value of a variable is. This is not an
exact replacement for a full debugging utility by any means, but is
the standard method for troubleshooting issues in most languages and
can be used for viewing sensor values or your own variables’ values.
The output from these
printf()statements can be viewed in the terminal by running
- Tasks. One common mistake that new
PROS users make is forgetting to include a
delay()statement in their tasks (this includes
opcontrol()too), starving the processor of resources and preventing the PROS kernel from running properly. Every infinite loop, like the one in
opcontrol(), needs to have a delay statement. We recommend at least 2ms.
I know C/C++, now how do I use PROS?¶
The PROS tutorials are designed to show the application of C/C++ programming to a PROS project. The Programming the Clawbot tutorial is a great place to start, as it goes through every step of putting together a sample PROS project. Once you are ready to branch out and create your own custom project, looking through the following tutorials is recommended:
VEX U team QUEEN has also created a series of YouTube videos about C++, object-oriented programming, and other relevant programming topics in the context of VEX robots; you can find it here.