Why does the sololearn bundle my whole program and at once asks for all inputs in c language???

Question

Well i made a calculator and hoped to run it in the same way it ran in my Ubuntu......but it looks like sololearn should improve there c language compiler so it also proceeds step wise like Ubunt gcc
https://code.sololearn.com/cxKG8MuXGxC2/?ref=app

Answer 1

code is compiled and ran on sololearn server. so input is required before the code is compiled

Answer 2

but in Ubuntu the code starts to execute and goes line wise and asks for input where its required and not all at once ....
ok, but still it totally changes the way the code reacts hence i believe for better experience and understanding they should look into this matter