Answer 1

alweena sabir Unfortunately, you cannot read files from your phone/computer onto sololearn. The playground is best suited for one file programs.

Answer 2

You will need to download a C compiler to your device. The Sololearn playground does not have access to your device storage.
Try: Cxxdroid - C/C++ compiler IDE

Answer 3

If you want to run a code on Sololearn then,
➡️ Go to the Code Playground section (you can find it here : https://code.sololearn.com) and click on the + icon at the bottom right corner.
➡️ Then select С and write your code and save it.
➡️ Then click on Run and your Code will get executed.