Compilare: user.cpp: In function ‘int main()’: user.cpp:93:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<polo.size(); i++) ^ user.cpp:44:39: 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:45:41: 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:49:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a); ^ user.cpp: In function ‘int conv(char)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int calc(int, int, int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ /tmp/ccwWRzua.o: In function `main': user.cpp:(.text.startup+0x83): warning: the `gets' function is dangerous and should not be used.