where should be the saved file will go

Answer 1

My computer... C drive... Turbo c++ or c3/c4........ Bin... Your saved file will be here....

Answer 2

it depends on the application you are using and where do you save the program

Answer 3

In sololearn, the program will be in the cloud.
In many other IDEs, the program will be in your device.(unless you use stuff like git to upload it to the cloud)