Question

I was reading a book and came across a program to read entries from a /proc file.
The program which they mentioned has following line

printf("%.*s", (int) n, line);

I am not clear with meaning of above line

1. what type of print if above "%.*s used instead of %s

The code can be read here

Answer 1

Abstract from here:

.* – The precision is not specified in
the format string, but as an
additional integer value argument
preceding the argument that has to be
formatted.

So this prints up to n characters from line string.