Compilare: user.cpp: In function ‘void read()’: user.cpp:86: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:90: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:94: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:97: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:154: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:155: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result /tmp/cccyAOJo.o: In function `read()': user.cpp:(.text+0x497): warning: the `gets' function is dangerous and should not be used.