bila.cpp: In function 'int mm(int, int)': bila.cpp:10: warning: unused variable 'ok' bila.cpp: In function 'int main()': bila.cpp:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result bila.cpp:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result bila.cpp:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result bila.cpp:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result bila.cpp: In function 'int mm(int, int)': bila.cpp:14: warning: 'l' may be used uninitialized in this function bila.cpp: In function 'int main()': bila.cpp:42: warning: 'val' may be used uninitialized in this function