What affects the size of a pointer in memory?

The size of a pointer in memory depends on the architecture of the processor and the operating system, not on the data type it points to. For example:

• On 32-bit systems, the pointer size is usually 4 bytes.
• On 64-bit systems, the pointer size is usually 8 bytes.

This is because a pointer stores an address in memory, and the size of the address depends on the architecture's bitness.

Example:

int* ptr; // size of ptr depends on architecture, not on int
char* cptr; // size of cptr is the same as ptr

Thus, the size of a pointer is determined by the platform, not by the data type it points to.