Sorting an integer array

Question

https://code.sololearn.com/cbUeOd44MuvS/#c

Can anyone explain me clearly how this program works with step by step execution

Answer 1

https://code.sololearn.com/cbUeOd44MuvS/#c

I can"t able to understand how the value allocated to a[i] and a[j].

Answer 2

read about c++ loops: https://www.sololearn.com/Course/CPlusPlus/?ref=app