where fixed length and variable length record uses?give an example using file name...

In fixed length records one should use padding for empty or non-filled spaces.

 

For example :-

 

18|Alice|21|F|Student*******************$

19|John|26|M|Professor*****************$

 

In variable length records padding is not required.

 

Alice|21|F|Student#

John|26|M|Professor#

 

Variable records are used when you're not aware of the size of the individual data fields or variables or if you want dynamic allocation of memory at run time so that it allocates as much memory as it is required avoiding unnecessary allocation of memory resources and for fixed length records it is used when you very well know the size of the individual fields or variables.

Edited February 7, 201213 yr by immortal