I wrote scanf("%d",&a); but it was ignored and didn't get an a from android virtual keyboard.

Answer 1

If you are coding in the solo learn app, it asks you for all user input before the program starts.

Answer 2

I didn't understand how it works in solo. After a program starts, following a code, it opens the blank to enter and submit a data.

Answer 3

Perhaps just try a compiler on your computer

Answer 4

I code on a smartphone. There are no problems with gcc compiler. But I'd like to work on phone when I have free time, so solo app promised that this app can get codes in it. I run code and see errors as if it was compiled.

Answer 5

Try another app with a g++ compiler. Do some research.