linux.gentoo.user

Does anyone know if a directory can be created from inside a C program
and how that is done? Suppose I run the code from my own directory
/home/mydir, and I want the code to create a directory
/home/mydir/mydata, where data is to be written, what would the format
for such a command be? Also, when you write files to
/home/mydir/mydata, do i put in something like "./mydata/filename" as
the filename to open/write?

Many thanks!
Denis
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