Is the size of the pointer always 4?

sizeof(char) == 1 Other than that, there is no fixed size of the data type.

I don't have to This means that there is no guarantee that sizeof(char*) == sizeof(int*).

Typically, on a 16-bit system, the pointer size is 2 On 32-bit systems, 4, On 64-bit systems, it is 8.

But it's not set as the C/C++ standard There is no way to determine the exact size of the pointer until you turn it around on your computer