Hello everyone:

As I stated previously I am learning my C++ on the run because is required for one of my classes and well any help I can get is appreciated. I created a code to read a .txt file containing a list of numbers. My problem is that the list of numbers is not being read the way I want to. According to my friend there is an easy solution, but I have not been able to find the answer. Here is the result I get when I run my code

number of data point:  4
x[ ]0x300300
0x300300
0x300300
0x300300
y[ ]0x300320
0x300320
0x300320
0x300320
T= 1 a= 0 b= 0 c= 0 d= 0 e= 0
r = nan

And here is my code

#include <iostream>
#include <fstream>
#include <sstream>
#include <cmath>
using namespace std;

void sum(double* x, double* y, int T, double* a, double* b, double* c, double* d, double* e);

int main (void)
{
unsigned long T;
ifstream in;
cout << "number of data point:  ";
cin >> T;
double* x = new double[T];
double* y = new double[T];
cout << "x[ ]";
in.open("x.txt");
if (!in)
{
cout << "Unable to open file";
exit(1); //terminates wih error
}
while (in >> T)
{
cout << x << "\n";
}
in.close();
cout << "y[ ]";
in.open("y.txt");
if (!in)
{
cout << "Unable to open file";
exit(1); //terminates wih error
}
while (in >> T)
{
cout << y << "\n";
}
in.close();
double a = 0.0;
double b = 0.0;
double c = 0.0;
double d = 0.0;
double e = 0.0;
sum(x,y,T, &a, &b, &c, &d, &e);
double r = (T*c-a*b)/sqrt((T*d-a*a)*(T*e-b*b));
delete[] x;
delete[] y;
cout <<"T= "<<T<<" a= "<<a<<" b= "<<b<<" c= "<<c<<" d= "<<d<<" e= "<<e<<"\n";
cout << "r = " << r << "\n";
return 0;
}

void sum(double* x, double* y, int T, double* a, double* b, double* c, double* d, double* e)
{
double sum_x = 0.0;
double sum_y = 0.0;
double sum_xy = 0.0;
double sum_x2 = 0.0;
double sum_y2 = 0.0;
for(unsigned long t=0;t<T;t++)
{ sum_x += x[t];
sum_y += y[t];
sum_xy += x[t]*y[t];
sum_x2 += x[t]*x[t];
sum_y2 += y[t]*y[t];
}
*a = sum_x;
*b = sum_y;
*c = sum_xy;
*d = sum_x2;
*e = sum_y2;
}//end of code

Can you see where the error is located ? I am pretty sure this is a dumb problem to have but any help will be appreciated. Thanks. Oh i attached both x.txt and y.txt file.

G:X

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Last Post by gcardonav

Sorry about that, I am a rookie in to the system and you are right. Apologize.

G

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