help with output files

[hockeydude95]

Hey so I have to output a bunch of data to a blank document and I can't figure out how to do it. I think it has something to do with my parameters of my function. Here is the error message:
Rocket3.C: In function â:
Rocket3.C:26:21: error: invalid operands of types â and â to binary â
Rocket3.C:35:20: error: invalid operands of types â and â to binary â
Rocket3.C: In function â:
Rocket3.C:71:16: error: invalid operands of types â and â to binary â
Rocket3.C:88:46: error: invalid initialization of non-const reference of type â from an rvalue of type â
Rocket3.C:9:6: error: in passing argument 7 of â
Rocket3.C:89:16: error: invalid operands of types â and â to binary â
Rocket3.C:90:16: error: invalid operands of types â and â to binary â
Rocket3.C:91:16: error: invalid operands of types â and â to binary â
Rocket3.C:92:16: error: invalid operands of types â and â to binary â
[1] + Done gedit

And here is the code:
#include <iostream> //
#include <fstream>
#include <cstdlib>
#include <cmath>
using namespace std; //allows access to cin and cout
void heightwithT(double dt, double b, double A, double mo, double mf, double* T1, std::ofstream &filename2)
{

double t;
double g = -9.8;
double h = 0;
double v = 0;
double mi;
double p = 1.225;
double k = -.5*p*A;
double Ti;
for(t = 0; t <= 1; t += dt)
{
Ti = b*t*(1-t);
mi = mo + (mf -mo)*(3*pow(t,2) - 2*pow(t,3));
v = v + dt*(g + k*pow(v, 2)/mi + (Ti/mi));
h = h + dt*v;
&filename2 << t << " " << v << " " << h << endl;
}
T1[0] = h;
T1[1] = v;
while(v >= 0)
{
v = v + dt*(g + k*pow(v, 2)/mf);
h = h + v*dt;
t = t + dt;
&filename2 << t << " " << v << " " << h << endl;
}
T1[2] = h;
T1[3] = t;
return;

}


int main()
{
const int SIZE = 60;
char filename[SIZE];
char filename2[SIZE];
ifstream file;
ofstream file2;
while(true)
{
cout << "Enter the name of file with data:\n" << "dt(s), b(N/s^2), A(m^2), mi(kg), mf(kg). \n";
cin.getline(filename, SIZE);
file.open(filename); // associate inFile with a file
if (!file.is_open()) // failed to open file
{
cout << "You typed the wrong file name \n" << filename << " can't be opened. Figure it out dude \n";
cout << "Peace out \n";
exit(EXIT_FAILURE);
}
cout << "Enter the name of blank output file";
cin.getline(filename2, SIZE);
file2.open(filename2);
if(!file2.is_open())
{
cout << "You typed the wrong file name \n" << filename << " can't be opened. Figure it out dude \n";
cout << "Peace out \n";
exit(EXIT_FAILURE);
}
filename2 << "T V H" << endl;
double dt;
double b;
double A;
double mo;
double mf;
file >> dt;
cout << "dt= " << dt << " s" <<endl;
file >> b;
cout << "b= " << b << " N/s^2" <<endl;
file >> A;
cout << "A= " << A << " m^2" <<endl;
file >> mo;
cout << "mi= " << mo << " kg" <<endl;
file >> mf;
cout << "mf= " << mf << " kg" <<endl;
double T1[4];
heightwithT(dt, b, A, mo, mf, T1, filename2);
filename2 << "Height after Thrust = " << T1[0] << "m" << endl;
filename2 << "Velocity after Thrust = " << T1[1] << "m/s" << endl;
filename2 << "Your max height = " << T1[2] << "m" << endl;
filename2 << "The total time = " << T1[3] << "s" << endl;
file.close();
file2.close();
}
return 0;
}

[Chervil]

In function main() you have

    filename2 << "Height after Thrust = " << T1[0] << "m" << endl;

which should be

    file2 << "Height after Thrust = " << T1[0] << "m" << endl;

Similarly the parameter passed to function heightwithT() should be file2, not filename2.

Inside function heightwithT(), you don't need the ampersand on these lines:
&filename2 << t << " " << v << " " << h << endl;
should look like:
filename2 << t << " " << v << " " << h << endl;

... though you should probably change the variable name to file2 in order to reflect the fact that it represents the output stream, not the name of the file.