div.cpp: In function 'int main()': div.cpp:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result div.cpp:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result div.cpp:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result div.cpp:17: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccAOaOVg.o: In function `main': div.cpp:(.text+0x6a): warning: the `gets' function is dangerous and should not be used.