Compilare: user.cpp: In function ‘int main()’: user.cpp:68: warning: unused variable ‘s’ user.cpp:80: warning: name lookup of ‘j’ changed user.cpp:72: warning: matches this ‘j’ under ISO standard rules user.cpp:76: warning: matches this ‘j’ under old rules user.cpp:61: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:62: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:64: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result