Compilare: user.cpp: In function ‘int main()’: user.cpp:14: warning: name lookup of ‘j’ changed user.cpp:4: warning: matches this ‘j’ under ISO standard rules user.cpp:12: warning: matches this ‘j’ under old rules user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:8: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result