Help with C++

Hello there. I've decided to have a little edit in a SRB2 Exe. but I don't know how to start.

I wanna make Sonic Double jump, not thok, where I can change this? and when he is on air, when Pressing Spindash button he goes to the floor, and plays a sound when he hits the floor. is it possible? (I'm trying to do SC Abilities)

I want to know where is sonic's S_SKIN. what's the name of his file?
And how do I save as a exe?

Thanks for the help.

Go to p_user.c and find case CA_THOK: for the abilities.

Sonic's S_SKIN is in r_things.c. Search for Sonic, and you'll find it.

Got it to work, now how to export to a SRB2 exe?

SRB2 is written in C, not C++.

Also, you don't "export" to EXEs. You compile human-readable source code into object code, and then link the object files together into an executable. If you're going to do anything with C, you should at the very least read up on an introductory C programming tutorial, so that you have an idea of how the basic concepts work. C's design is strikingly simple, yet is challenging to learn unless you go in with the right mindset.