placa.cpp: In function 'int main()': placa.cpp:162: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result placa.cpp:163: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result placa.cpp:165: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result placa.cpp:191: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result placa.cpp: In function 'int getnum(PPoint, PPoint, PPoint)': placa.cpp:118: warning: control reaches end of non-void function