# Complete behavior [Back to C](https://rustic-game-engine.pages.dev/markdown/scripting/c.md). Complete the [setup and attachment steps](https://rustic-game-engine.pages.dev/markdown/scripting/c/setup-and-attachment.md), then paste this behavior into the attached script. ```c #include "rustic.h" void start(void) { rustic.log("info", "Behavior started"); } void fixed(double dt) { RusticVector3 p = rustic.get_translation(); if (rustic.key("KeyW").held) rustic.set_translation(p.x, p.y, p.z + dt); } int main(void) { return rustic_run((RusticBehavior){.on_start=start, .fixed_update=fixed}); } ``` The SDK is staged automatically beside the source in an engine temporary directory. You do not install a package, copy the SDK into your game, or write a process loop. **Programming > Open Programming Workspace** also writes editor support files under `.rustic/generated/programming`. Regenerate those files after upgrading Rustic. Edit your behavior source, not generated SDK files. Run through Rustic Play so the engine can supply the API and callback state.