Compilare: user.cpp:9: warning: left shift count >= width of type user.cpp:9: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp: In function ‘int main()’: user.cpp:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void sieve()’: user.cpp:22: warning: array subscript is below array bounds user.cpp:25: warning: array subscript is below array bounds