how can i export results of my calculation fom my c++ programme

[PalashMudit]

Hey everybody,
I need some help here. I have to create a project to plot Cartesian graphs. Until now i am using c++ to calculate the Cartesian coordinates, but i need further development. I enter a loop where my x coordinate every time adds 0.1, and the corresponding y coordinate for the given equation is created.
I have an equation :-
100y+22.09x=2209
and, my code goes as given below. Sample output, of first 6 x and y coordinates is also given (here also i had to type all the values)
But i need to get this information out of c++. Until now, i have to copy all the coordinates one by one. i need a tag which could export this info in another form, like word doc, or spreadsheet(x coordinate and y coordinate as 2 separate columns).
Please help.

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
  for (i=0;i<10;i=i+0.1)
{
cout<<"\n\nX coordinate = "<<i;
y2=((a*b)-(b*i*i))/a;
e=sqrt(y2);
cout<<"\nY coordinate = "<<e;
getch();
}
getch();
}

x coordinate = 0
y coordinate = 4.7

x coordinate = 0.1
y coordinate = 4.699765

x coordinate = 0.2
y coordinate = 4.69906

x coordinate = 0.3
y coordinate = 4.697885

x coordinate = 0.4
y coordinate = 4.696238

x coordinate = 0.5
y coordinate = 4.694121

[o3hC5Di1]

Hi there,

You could write your coordinates in CSV format, that would probably be the simplest way to make the information available as a spreadsheet.

http://en.wikipedia.org/wiki/Comma-separated_values#Basic_rules_and_examples

std::ifstream ifs("coordinates.csv");

//in your loop
ifs << x << "," << y << "\r\n";

Hope that helps.

All the best,
NwN

[PalashMudit]

NwN,
I am not very Good at c++. I did not fully understand ur answer. I need more explained answer.
so, according to you, in my code, i should write like this:-

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
double i,a,b,e,y2;
//the values of a and be a are are already inputed by the user in the earlier phase of my code
  for (i=0;i<10;i=i+0.1)
{
cout<<"\n\nX coordinate = "<<i;
y2=((a*b)-(b*i*i))/a;
e=sqrt(y2);
cout<<"\nY coordinate = "<<e;
getch();
}
std::ifstream ifs("coordinates.csv");
ifs << x << "," << y << "\r\n";
getch();
}

Would this create this "coordinates,csv" in its main folder, every time i run the software and it calculates the required result?
And also please tell if any libraries are required to mention
I am asking cause i didnt understand the wiki u have mentioned

Very Much Thanks

[TheIdeasMan]

Also, you shouldn't use FP numbers in a loop. They are not exact. Instead calculate the number of times the loop needs to run, and convert that to an int. Should be easy (EndValue - StartValue) / StepValue, so for you this (10.0 - 0.0) / 0.1 = 100.0. Use static_cast<int> to do the casting.

So use ints as variable types in the for loop, but double types inside the loop.

Also, it is always int main() never void main()

[keskiverto]

Apparent typo in NwN's code: s/if/of/

Read about std::ofstream http://www.cplusplus.com/reference/fstream/ofstream/

Alternatively, replace the "ifs" with "std::cout", e.g. remove lines 8 and 11, and replace 12 with NwN's 4.

[PalashMudit]

Thanks