Eroare de compilare: user.cpp:2:1: error: ‘ifstream’ does not name a type ifstream f("g2.in");ofstream g("g2.out");int n,i; string x;int main(){std::f>>n;for(i=9; i>1; i--)while(n%i==0){x+=i;n/=i;}std::g<<x;} ^ user.cpp:2:21: error: ‘ofstream’ does not name a type ifstream f("g2.in");ofstream g("g2.out");int n,i; string x;int main(){std::f>>n;for(i=9; i>1; i--)while(n%i==0){x+=i;n/=i;}std::g<<x;} ^ user.cpp:2:51: error: ‘string’ does not name a type ifstream f("g2.in");ofstream g("g2.out");int n,i; string x;int main(){std::f>>n;for(i=9; i>1; i--)while(n%i==0){x+=i;n/=i;}std::g<<x;} ^ user.cpp: In function ‘int main()’: user.cpp:2:71: error: ‘f’ is not a member of ‘std’ ifstream f("g2.in");ofstream g("g2.out");int n,i; string x;int main(){std::f>>n;for(i=9; i>1; i--)while(n%i==0){x+=i;n/=i;}std::g<<x;} ^ user.cpp:2:113: error: ‘x’ was not declared in this scope ifstream f("g2.in");ofstream g("g2.out");int n,i; string x;int main(){std::f>>n;for(i=9; i>1; i--)while(n%i==0){x+=i;n/=i;}std::g<<x;} ^ user.cpp:2:124: error: ‘g’ is not a member of ‘std’ ifstream f("g2.in");ofstream g("g2.out");int n,i; string x;int main(){std::f>>n;for(i=9; i>1; i--)while(n%i==0){x+=i;n/=i;}std::g<<x;} ^ user.cpp:2:132: error: ‘x’ was not declared in this scope ifstream f("g2.in");ofstream g("g2.out");int n,i; string x;int main(){std::f>>n;for(i=9; i>1; i--)while(n%i==0){x+=i;n/=i;}std::g<<x;} ^