What is this j for?

abs() shows the absolute distance from the 0 point, for complex numbers, too. Please refer to this post below: https://www.sololearn.com/Discuss/2209933/?ref=app

Tanji Plz don't put your links in tags, it's of no use Put your links in the description of the question

Let's look at the code first https://code.sololearn.com/c6vqpbskp8pi/?ref=app which appears to be invalid ... so I'm guessing this is nolonger a question... Tanji ??