Compilare: user.cpp: In function ‘int main()’: user.cpp:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void read()’: user.cpp:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cc4n2xiH.o: In function `read()': user.cpp:(.text+0x328): warning: the `gets' function is dangerous and should not be used.