Compilare: user.cpp: In member function ‘Matrice Matrice::operator*(Matrice)’: user.cpp:29:23: warning: unused variable ‘i’ [-Wunused-variable] unsigned char i, j; ^ user.cpp:29:26: warning: unused variable ‘j’ [-Wunused-variable] unsigned char i, j; ^ user.cpp: In member function ‘void Matrice::operator=(Matrice)’: user.cpp:45:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[i][j] = m.get(i,j); ^ user.cpp:45:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[i][j] = m.get(i,j); ^ user.cpp: In function ‘int main()’: user.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; (1<<i) <= p; i++) ^