What languages ​​should be emphasized in training for programming applications on android / ios?

Question

Mobile development

In college we study C++, html/css, PHP, sql, mysql. (well, Pascal / Delphi also passed as a start)
The question itself is what other programming languages ​​you need to know so that you can write an application for android or ios (preferably Andrew).
PS The question can be put incorrectly but nevertheless.

Answer 1

android ─JAVA
ios ─ object-c, swift
client-server (platform not important) ─ REST

Answer 2

It is worth emphasizing the study of the basics of working with computers and, in particular, methods of searching for information on the Internet.