Compilare: user.cpp: In function ‘int main()’: user.cpp:22: warning: suggest parentheses around assignment used as truth value user.cpp:23: warning: suggest parentheses around assignment used as truth value user.cpp:24: warning: suggest parentheses around assignment used as truth value user.cpp:8: warning: unused variable ‘j’ user.cpp:11: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ‘l’ may be used uninitialized in this function