Compilare: user.cpp: In function ‘int main()’: user.cpp:27:56: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘__gnu_cxx::__promote_2<int, int, double, double>::__type {aka double}’ [-Wformat=] if (n <= counter - 1) printf("%d",pow(prime[n+1],2)); ^ user.cpp:31:32: warning: left operand of comma operator has no effect [-Wunused-value] for (int i = a + 1; i <= 1300000, counter < n + 1; i++) ~~^~~~~~~~~~ user.cpp:37:38: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘__gnu_cxx::__promote_2<int, int, double, double>::__type {aka double}’ [-Wformat=] printf("%d",pow(prime[n+1],2)); ^ user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("prim.out","w" , stdout); ^