Data files always contain large information and the information always changes. The changed information
should be updated otherwise the data files are not useful. Thus to update data in the file we need to update the
data files with latest information. To update a particular record of data file it may be stored anywhere in the file
but it is necessary to obtain at which location (in terms of byte number) the data object is stored.
The sizeof() operator determines the size of object. Consider the following statements.
(a) int size=sizeof(o);
Where, o is an object and size is an integer variable. The ...
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