42 school subject.

Create quine programs in C as an introduction to the concept of virus propagation in cybersecurity.

A quine is a program that outputs its own content.
An empty program or program that opens and reads its file is prohibited.

A quine program in c that outputs itself in the console.
%c displays char and %s displays a string.
In printf 10 is ASCII code for \n and 34 for ".
Between % and c or s, 1$ refers to 10 and 2$ TO 34 and $3 to str.
Basically a string representing the program is printed which is also able to print itself by using a self referential embedded format tag.

Outputs its content in another file.

The program creates a new file, writes its own content into that file and executes the file, leading to the creation of another file who also created another file and so on, leading to a self-replicating program which is useful for viruses to propagate.

Self-replicating Python code | Quine
what does print(s%%s) mean here?
Imprimer le code source du code C sans aucune entrée | Quiné