Compilare: user.cpp: In function ‘int main()’: user.cpp:39: warning: name lookup of ‘i’ changed user.cpp:25: warning: matches this ‘i’ under ISO standard rules user.cpp:37: warning: matches this ‘i’ under old rules user.cpp:21: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result