Question

I compile the application for 64 bit Windows operating system.
The application should save 64 bit addresses, I have to decide about variable type, to save them. I thought to save them in long. But sizeof(long) == 4.Where and how can I save the addresses

Answer 1

You should store memory addresses in pointers:

void *myaddr = 0x0123456789ABCDEF; // memory address
int *myaddr2 = 0x0123456789ABCDEF; // pointer to int in memory, dereferencable

You can get the address of a variable like this:

int myvar;
int *addrofmyvar = &myvar;
printf("%p", addrofmyvar); // use %p to print pointers

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Note: there are some differences between C and C++ regarding pointers (esp. void pointers). See the C and C++ standards. There is no such thing as “C/C++”.