Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:6:2: error: ‘in’ was not declared in this scope {in>>n;for(i=2;i<=n;i++)prim[i]=1;for(i=1;i<=n;i++){if(prim[i]){++cnt;for(j=i+i;j<=n;j+=i)prim[j]=0;}}out<<cnt;} ^ user.cpp:6:103: error: ‘out’ was not declared in this scope {in>>n;for(i=2;i<=n;i++)prim[i]=1;for(i=1;i<=n;i++){if(prim[i]){++cnt;for(j=i+i;j<=n;j+=i)prim[j]=0;}}out<<cnt;} ^