Where is `%p` useful with printf?

Question

After all, both these statements do the same thing...

int a = 10;
int *b = &a;
printf(\"%p\\n\",b);
printf(\"%08X\\n\",b);

For example

Answer 1

You cannot depend on %p displaying a 0x prefix. On Visual C++, it does not. Use %#p to be portable.