Can I develop an app using c or cpp

Answer 1

yes you can!!
;)

Answer 2

yes you can C/C++ and objective C most probably for iOS ... you may reuse those libraries in other android apps too but develope each independently it is not recommended to use same code for same app to both of operating system (iOS and Android)

Answer 3

you can run the code with ide for your android. after all cpp is cross platform. and im not sure you can develop a gui or apk with c or cpp.

Answer 4

yes