divizori1.cpp: In function 'int main()': divizori1.cpp:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result divizori1.cpp:22: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result divizori1.cpp:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result divizori1.cpp:25: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result divizori1.cpp:23: warning: 'elem' may be used uninitialized in this function /tmp/ccQIhxtn.o: In function `main': divizori1.cpp:(.text+0xe2): warning: the `gets' function is dangerous and should not be used.