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Display free disk space in DOS systems

#include <stdio.h> #include <dos.h> void main(void) { struct dfree diskinfo; long disk_space; getdfree(3, &diskinfo); disk_space = (long) diskinfo.df_avail * (long) diskinfo.df_bsec * (long) diskinfo.df_sclus; printf("Available disk space %ld\n", disk_space); }