Compilare: user.cpp: In function ‘void mulMatrix(int (*)[2], int (*)[2])’: user.cpp:17:21: warning: argument to ‘sizeof’ in ‘void* memcpy(void*, const void*, size_t)’ call is the same expression as the source; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memcpy(C, A, sizeof(A)); ^ user.cpp:18:21: warning: argument to ‘sizeof’ in ‘void* memcpy(void*, const void*, size_t)’ call is the same expression as the source; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memcpy(D, B, sizeof(B)); ^