Is this a double free in C?

Question

Normally, if a pointer is freed twice, it\'s a double free. For example,

char *ptr;
ptr=malloc(5 * sizeof(*ptr));
free(ptr);
free(ptr);

The

Answer 1

Yes as the pointers both point to the same address and so pass the same address to free.

You can show what the value of the pointer is by printing it

printf( "%p", ptr);

or look at it in a debugger