Error: invalid operands of types `double' and `double' to binary `operator>>'

[xelloss]

#include<cstdlib>
#include<iostream>
#include<iomanip>
#include<vector>
   #include<fstream>
using namespace std;
 
double sum(vector<double> x)
 {
    double total = 0.0; 
    for (int i=0; i<x.size(); i++) {
        total = total + x[i];  
    }
    return total;
}
 
 
 
int main()
{ vector<double> numbers;
    double number;
 int n;
    ifstream in("data.txt");
    while(in>>number)
    {numbers.push_back(number);      }
     for(int i=0;i<numbers.size();i++) 
n= numbers.size();    
    double k=sum(numbers);
double y;
  y=k/n;
 
     cout<<"mean of the values is:"<<" "<<y<<endl;
 
 for(int i=0;i<numbers.size();i++) 
{ double m= ((numbers[i]-y)*(numbers[i]-y));
     vector<double> digits;
     double digit;
     while(m>>digit)
     {digits.push_back(digit);}
     double f=sum(digits);
     double w=f/n;  
cout<<"variance of the values is:"<<w<<endl;}
 

hmmm,trying to calculate variance from values in vectors.but keep getting error saying invalid operands of types `double' and `double' to binary `operator>>' what does tt mean n what shld i do?

[sicarie]

The line 38 above, 'while (m>>digit)' . You declare m as a double, and then try to use it as you would a filehandle and read data in from it. So your types don't match, which is giving you that error.

[sicarie]

Also, I've changed the thread title, please have a look at the Posting Guidelines, as we ask that when you post you do things like use a good thread title, code tags, etc... Thanks!