Compilare: user.cpp: In function ‘int main()’: user.cpp:50:10: warning: variable ‘ch’ set but not used [-Wunused-but-set-variable] char ch; ^ user.cpp:40:37: 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:41:39: 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:45:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ user.cpp: In function ‘int operatie(int, int, char)’: user.cpp:36:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ /tmp/cccyUAD3.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.