Printf

printf is a Commande Unix making it possible to make post a Character string to the screen.

It is also a name of function of the Langage C, Perl and other languages data-processing making it possible to post one or more variables in a way formatted in flow of exit.

Out of C, one uses it as follows:
printf (" hello, world");
but one should not especially forget to put this directive processor:
#include

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