Запись в файл

using namespace std;
fstream file;
double Pi=9*3.14/5;
double R1=30, R2=25, R3=50, R4=1.88, R5=15, R6=50;
double E0=15, L=5.57*pow(10.0,-3), C=20*pow(10.0,-6);
double f=70, fi=Pi, t0=0, t1=0.01, t2=0.02;
double w=2*Pi*f;
double n=200;
//
double func_E(double t){
double E;
if(t<t1){
E=E0+E0*sin(w*t+fi);}
else E=0;
return E;}
//
double func_fI( double t, double I, double U){
double fI;
fI=(func_E(t)*R2/(R1+R2)-I*(R4+R1*R2/(R1+R2)+R3*(R5+R6)/(R3+R5+R6))-U*(R5+R6)/(R3+R5+R6))/L;
return fI;}
 
//
double func_fU(double t, double I, double U){
double fU;
fU=(I*(R5+R6)/(R3+R5+R6)-U/(R3+R5+R6))/C;
return fU;}
 
 
int main(){
int k=1;
double t,U,I,I0=0, U0=0;
double h;
h=(t2-t0)/n;
file.open("С:/out_file.xls", ios::out);
file.setf(ios::right);
file.setf(ios::fixed);
cout<<setw(15)<<"k"<<setw(15)<<"t"<<setw(15)<<"I"<<setw(15)<<"U"<<endl;
file<<"k"<<"\t"<<"t"<<"\t"<<"I"<<"\t" <<"U"<<endl;
for (t=t0;t<t2;t=t+h){
cout<<setw(15)<<k<<setw(15)<<t<<setw(15)<<I0<<setw(15)<<U0<<endl;
file<<k<<"\t"<<t<<"\t"<<I0<<"\t"<<U0<<endl;
I=I0+(h/2)*(func_fI(t,I0,U0)+func_fI(t+h,I0+h*func_fI(t,I0,U0),U0+h*func_fU(t,I0,U0)));
U=U0+(h/2)*(func_fU(t,I0,U0)+func_fU(t+h,I0+h*func_fI(t,I0,U0),U0+h*func_fU(t,I0,U0)));
I0=I;
U0=U;
k=k++; }
file.close();
system("pause");
return 0;
}

 file.open("out_file.xls", ios::out);