Compilare: user.cpp: In function ‘int main()’: user.cpp:107: warning: name lookup of ‘k’ changed user.cpp:11: warning: matches this ‘k’ under ISO standard rules user.cpp:76: warning: matches this ‘k’ under old rules user.cpp:75: warning: unused variable ‘x’ 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 ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result