Compilare: user.cpp: In function ‘int main()’: user.cpp:50: 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 ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:52: 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 user.cpp:66: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:105: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:111: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccpR5teB.o: In function `main': user.cpp:(.text+0x3b2): warning: the `gets' function is dangerous and should not be used.