Compilare: main.cpp: In function 'int main()': main.cpp:26:114: warning: array subscript has type 'char' [-Wchar-subscripts] while(operatori.empty() == false && numere.size() > 2 && operatori.top() != '(' && grad[ expresie[i] ] <= grad[operatori.top()]) ^ main.cpp:26:139: warning: array subscript has type 'char' [-Wchar-subscripts] while(operatori.empty() == false && numere.size() > 2 && operatori.top() != '(' && grad[ expresie[i] ] <= grad[operatori.top()]) ^ main.cpp:12:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("expresie.in" , "r" , stdin); ^ main.cpp:13:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("expresie.out" , "w" , stdout); ^ main.cpp:14:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",expresie); ^