Compilare: user.cpp: In function ‘int main()’: user.cpp:24:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(expresie); ++i) { ^ user.cpp: In function ‘int calcul_expresie(int, int)’: user.cpp:47:42: warning: variable ‘suma’ set but not used [-Wunused-but-set-variable] bool produs = false, divide = false, suma = false, scadere = false; ^