A quine is a non-empty computer program which takes no input and produces a copy of its own source code as its only output. The standard terms for these programs in the computability theory and computer science literature are "self-replicating programs", "self-reproducing programs", and "self-copying programs". source Wikipedia
It's a simple quine
It's a simple quine but it doesn't have a declared main only define
It's the funniest one. The program replicate and execute himself as many times as specified in the source code
There are some tools which create a quine from a normal program with some condition# Dr_quine