Could someone explain, what is actually happening there?

Question

https://code.sololearn.com/cjP3UwQ5p8Ih/?ref=app

Answer 1

Your code runs an infinite loop. It happens because you increment <num> by one, until <num> becomes 6, where an `if` block decremented <num> to 5. This happens over and over.

Answer 2

Its quite simple:
once num reaches 5 it gets increased up to six first

then as it is already six if(num==6) is true

then because of num= num-1;
num gets decreased back to 5

and loop repeats itself for infinity....