Compilare: user.cpp: In member function ‘int Mare::zero()’: user.cpp:201: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp: In function ‘int main()’: user.cpp:301: warning: unused variable ‘suma’ user.cpp:302: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:303: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:304: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:309: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result