Accessing Members of a Structure
Each member of a structure can be used just like a normal variable, but its name will be a bit longer.
To return to the examples above, member name of structure st_rec will behave just like a normal array of char, however we refer to it by the name
st_rec.name
Here the dot is an operator which selects a member from a structure.
Where we have a pointer to a structure we could dereference the pointer and then use dot as a member selector.
This method is a little clumsy to type.
Since selecting a member from a structure pointer happens frequently, it has its own operator - which acts as follows.
Assume that st_ptr is a pointer to a structure of type student
We would refer to the name member as
st_ptr - name
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