- #1

Joon

- 85

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I have computed the total length of a 3D triangle and its area. The code is shown below.

I want to use file output instead of cout. The file name, cw2task1output, was just given as part of the task, in this case should I make an empty text file named cw2task1output then attach it to the resource file? Would the results be then shown on the created text file? Thanks.

I want to use file output instead of cout. The file name, cw2task1output, was just given as part of the task, in this case should I make an empty text file named cw2task1output then attach it to the resource file? Would the results be then shown on the created text file? Thanks.

C:

```
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
void foutput(double length, double area);
int main()
{
double total_length, area, x1, x2, x3, y1, y2, y3, z1, z2, z3, side12,
side13, side23, halfparameter;
int i, count;
ifstream inFile("triangle_cw2(1).txt");
string line, c;
char ch;
if (inFile.is_open()) {
getline(inFile, line);
}
inFile >> ch >> x1 >> y1 >> z1;
inFile >> ch >> x2 >> y2 >> z2;
inFile >> ch >> x3 >> y3 >> z3;
total_length = sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1) + (z2 - z1) * (z2 - z1)) + sqrt((x3 - x1) * (x3 - x1) + (y3 - y1) * (y3 - y1) + (z3 - z1) * (z3 - z1)) + sqrt((x3 - x2) * (x3 - x2) + (y3 - y2) * (y3 - y2) + (z3 - z2) * (z3 - z2));
side12 = sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1) + (z2 - z1) * (z2 - z1));
side13 = sqrt((x3 - x1) * (x3 - x1) + (y3 - y1) * (y3 - y1) + (z3 - z1) * (z3 - z1));
side23 = sqrt((x3 - x2) * (x3 - x2) + (y3 - y2) * (y3 - y2) + (z3 - z2) * (z3 - z2));
halfparameter = (side12 + side13 + side23) / 2;
area = sqrt(halfparameter * (halfparameter - side12) * (halfparameter - side13) * (halfparameter - side23));
inFile.close();
foutput(total_length, area); // You must use this function for output.
// Do not use system("pause") for this task
return 0;
}
//////// Using the funtion below for output. /////
void foutput(double total_length, double area)
{
ofstream cw2task1output;
cw2task1output.open("cw2task1output.txt");
cw2task1output << "The total length of sides = " << total_length << endl;
cw2task1output << "The area of triangle = " << area << endl;
cw2task1output.close();
}
```

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