Is it true that anything that can be coded in one programming language can be done in any other language? For instance, is it possible to code an Android App in c or c++ instead of Java?
Yes,the only difference being, some languages give inbuilt libraries for certain implementations while in others, you may have to implement it by yourself. Take for example: consider A and B to be matrices, In Octave you can multiply them by just doing A*B, while in other languages, like C, you should write the full code yourself.