What is this piece of code stand for??? And how this thing works?

Question

printf("%s%13s\n","Element","Value");

Answer 1

The percent in the first string to printf states you want argument replacement. The s states the argument will be a string. The optional number states you want a minimum of 13 characters. This reference gives the full syntax.
http://www.cplusplus.com/reference/cstdio/printf/

Answer 2

%13s -> leave space for 13 characters

Answer 3

thank u 😊