Compilare: user.cpp: In function ‘int main()’: user.cpp:96: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:97: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:100: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:103: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cc4X9k7O.o: In function `main': user.cpp:(.text+0x2ab): warning: the `gets' function is dangerous and should not be used.