don't have money to buy PC but want to learn programming

Are you a primary school student or a high school student or a student studying in college and don't have enough money to buy PC or face problem to carry laptop or if you are thinking about a problem and want to check logic of codes you think but taking out laptop in a place where it feel awkward, coding in phone with the help of app which is the best alternative of this problem. 

So there are some apps available in play store which I also use like:

1) online compiler

2) Decoder

3) code editor