Any time you need to pass a data structure you need a pointer. You can pass simple data types (char, float, or int) but if you want to get a value back from a function more than just a return value, you need a pointer.
Where you wish to pass a large chunk of memory through a function argument.
1. You would like to change a variable across files and one good practice is to send that variable as a pointer and get modified in called function.
Linked lists, where the devices are getting attached and removed at run time.
There are many advantages of pointers such as-
- They are used to save memory.
- When two references point to the same memory location.
- Can be used in the form of parameter passing.
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