tan.cpp: In function 'int main()': tan.cpp:14: warning: unused variable 'fq' tan.cpp:15: warning: unused variable 'ultima' tan.cpp:16: warning: unused variable 'prima' tan.cpp:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tan.cpp:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tan.cpp:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result