Compilare: user.cpp: In function ‘int main()’: user.cpp:17: warning: comparison between signed and unsigned integer expressions user.cpp:22: warning: array subscript has type ‘char’ user.cpp:31: warning: array subscript has type ‘char’ user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:11: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cc5GbhqJ.o: In function `main': user.cpp:(.text+0xb5): warning: the `gets' function is dangerous and should not be used.