Compilare: user.cpp: In function ‘void read()’: user.cpp:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:11: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:69: warning: unused variable ‘d’ user.cpp:70: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:71: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result /tmp/cctQT9U6.o: In function `read()': user.cpp:(.text+0x25a): warning: the `gets' function is dangerous and should not be used.