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Only void, const void, and std::nullptr_t pointer types are valid. If you want to display the address of an arbitrary pointer, you must cast it to (const) void*.
In the main function, a double variable named d is initialized with the value 123.456789. The program then prints the address of this variable using std::format.
The first commented-out line attempts to print the address of d directly using std::format("{}", &d). This line is commented out because it would result in a compilation error. The std::format function requires the pointer to be cast to void* or const void* to format it correctly.
The next three lines demonstrate the correct way to format and print pointers using std::format. The first of these lines prints the address of d after casting it to void*. The second line prints the address of d after casting it to const void*. The third line prints the value nullptr, which represents a null pointer.
Each of these lines uses std::cout to print a descriptive message followed by the formatted pointer. The std::format function is used to convert the pointer to a string representation that can be printed to the console.
