Compilare: user.cpp: In function ‘int main()’: user.cpp:111: warning: unused variable ‘s’ user.cpp:123: warning: name lookup of ‘j’ changed user.cpp:115: warning: matches this ‘j’ under ISO standard rules user.cpp:119: warning: matches this ‘j’ under old rules user.cpp:104: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:105: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:107: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:112: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result