cartoane.cpp: In function 'int cartoane(int, int)': cartoane.cpp:8: warning: unused variable 'cv1' cartoane.cpp:8: warning: unused variable 'cv2' cartoane.cpp: In function 'int main()': cartoane.cpp:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result cartoane.cpp:73: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result cartoane.cpp:74: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result