Compilare: user.cpp: In function ‘int main()’: user.cpp:50: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning user.cpp:49: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:56: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result 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 ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result