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In C, declaring a char pointer like this
char* p="Hello";
allocates some memory for a string literal Hello\0. When I do this afterwards
p="FTW";
what happens to the memory allocated to Hello\0? Is the address p points to changed?
There is no dynamic memory allocation in either statement.
Those strings are stored in your executable, loaded in a (likely read-only) section of memory that will live as long as your process does.
The second assignment only changes what
ppoints to. Nothing else happens.