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In C, function pointers are used to fix runtime binding. It stores the address of the function and calls it whenever needed. Function pointer, unlike other pointers, does not point to the data, but points to the code. It typically stores the start of executable code. It does not allocate memory using function pointers, and its name is also used to fetch function addresses.

Pointer size in C/C++ may vary, and it depends on different factors like operating system, CPU architecture, etc. The pointer size depends on the word size of the underlying processor. For example, in a 32-bit computer, the pointer size can be 4 bytes, and in a 64-bit processor computer, the pointer size can be 8 bytes.

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