puncte.cpp: In function 'void back(int, int)': puncte.cpp:29: warning: unused variable 'i' puncte.cpp: In function 'int main()': puncte.cpp:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result puncte.cpp:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result