greutati.cpp: In function 'int main()': greutati.cpp:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result greutati.cpp:71: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result greutati.cpp:73: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result greutati.cpp:74: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result greutati.cpp:90: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result /tmp/ccQrl6b4.o: In function `main': greutati.cpp:(.text+0xaa): warning: the `gets' function is dangerous and should not be used.