Question on Unions in C

So, I know that a pointer is a variable that stores a memory address (basic 4 or 8 bytes). If I place a pointer in a Union type, does the memory address stored by the pointer share the same memory space as the other types, or does the data at the memory address share the same memory?

Or, in other words, if I union a double and a char*, will I memory leak/segfault if I assign the double to anything?

>>5
I'm showing that the pointer itself and not what it points to is what is shared in memory with the rest of the union, which is what the OP asked about you fuckface.

>>8
It's not fucking relevant to what I'm demonstrating you cockdick.