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cs102238@lux.latrobe.edu.au (Gregary John Boyles ) wrote:

>PROBLEM 1.
[snip]

>With this statement DiskInfo.df_total*DiskInfo.df_sclus*DiskInfo.df_bsec calculated
>using my calculator produces the correct drive capacity i.e. 360K however
>DriveSize does not contain the correct value i.e. 32000 instead of 360000 (approximate).
>Why is this happening? The above fields are of type unsigned.

>PROBLEM 2.
>long DriveSize;
>struct dfree DiskInfo;
>.
>.
>.

>getdfree(DriveNum,&DiskInfo);
>DriveSize=DiskInfo.df_total*DiskInfo.df_sclus*DiskInfo.df_bsec;

     What are the types of the vars in the multiplication?  If they
were (say) all int, there would be no type conversion.  Overflow could
occur.  This is probably your problem.

>df_total:clusters
>df_sclus:sectors/cluster
>df_bsec:bytes/sector


>PROBLEM 3.
>When I want to output a long int type varaible with printf, it prints out
>a garbage value for the variable despite declaring it as a li/ld in the
>format string. What am I doing wrong?

     1) What is the value of the variable?  If it contains a garbage
value, that's what you'll get.  2) Maybe your printf() is wrong: post
it.
  
>PROBLEM 4.
[snip]

Sincerely,

Gene Wirchenko

C Pronunciation Guide:
     y=x++;     "wye equals ex plus plus semicolon"
     x=x++;     "ex equals ex doublecross semicolon"