prog.cpp: In function 'int main()':
prog.cpp:6:8: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
free(p);
^
In file included from /usr/include/c++/5/cstdlib:72:0,
from prog.cpp:1:
/usr/include/stdlib.h:483:13: note: initializing argument 1 of 'void free(void*)'
extern void free (void *__ptr) __THROW;
^