Compilare: user.cpp: In function ‘void back()’: user.cpp:91: warning: unused variable ‘k’ user.cpp: In function ‘int main()’: user.cpp:115: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:116: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:118: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:123: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result