Compilare: user.cpp: In function ‘int eval()’: user.cpp:34:13: warning: value computed is not used [-Wunused-value] *s++; ^ user.cpp: In function ‘int paran()’: user.cpp:46:13: warning: value computed is not used [-Wunused-value] *s++; ^ user.cpp:50:17: warning: value computed is not used [-Wunused-value] *s++; ^ user.cpp:54:13: warning: value computed is not used [-Wunused-value] *s++; ^ user.cpp:56:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < p.size();i++) { ^ user.cpp:64:13: warning: value computed is not used [-Wunused-value] *s++; ^ user.cpp:68:17: warning: value computed is not used [-Wunused-value] *s++; ^ user.cpp:72:13: warning: value computed is not used [-Wunused-value] *s++; ^ user.cpp: In function ‘int main()’: user.cpp:90:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.in", "r", stdin); ^ user.cpp:91:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.out", "w", stdout); ^