Compilare: user.cpp: In function ‘bool expresie()’: user.cpp:148:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int poz = 0;poz < operatori.size();++poz) ^ user.cpp: In function ‘void citire()’: user.cpp:15:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.in","r",stdin); ^ user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.out","w",stdout); ^ user.cpp:17:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(sir); ^ user.cpp: In function ‘int main()’: user.cpp:161:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:170:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ /tmp/ccUsFqrJ.o: In function `citire()': user.cpp:(.text+0x4d): warning: the `gets' function is dangerous and should not be used.