Create a directory in C

main.c

// gcc main.c -o main

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

int main()
{
	mkdir("newdir", S_IRWXU); // S_IRWXU is the mode, it gives read/write/search access to the user.
	FILE *out = fopen("newdir/newfile.txt", "w");
	fprintf(out, "Hello new directory!\n");
	fclose(out);
	return EXIT_SUCCESS;
}