Compilare: user.cpp: In function ‘void atrib(int*, int*)’: user.cpp:19:22: warning: argument to ‘sizeof’ in ‘void* memcpy(void*, const void*, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memcpy(a, b, sizeof a); ^ user.cpp: In function ‘void multiply(int*, int*, int*)’: user.cpp:25:22: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset(c, 0, sizeof c); ^