Compilare: user.cpp: In function ‘void inmultMat(long long int (*)[3], long long int (*)[3])’: user.cpp:21:31: 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(mat, matFin, sizeof(mat)); ^ user.cpp: In function ‘int main()’: user.cpp:66:37: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d\n", matrice[0][0]); ^ user.cpp:54:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("2sah.out", "w", stdout); ^