Compilare: user.cpp: In function ‘int evaluare()’: user.cpp:55:21: warning: unused variable ‘aux’ [-Wunused-variable] int aux =calc(val1,val2,ST.top()); ^ user.cpp: In function ‘int main()’: user.cpp:90:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in" ,"r", stdin); ^ user.cpp:91:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out", "w", stdout); ^ user.cpp:92:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^