Compilare: user.cpp: In function ‘int main()’: user.cpp:8: warning: format ‘%hu’ expects type ‘short unsigned int*’, but argument 2 has type ‘char*’ user.cpp:10: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:4: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:5: 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 ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result