reading a datafile within a programme

[qwertyu1234]

Hello again all,

first of all, thanks for all the replies that I have received earlier, they really help me as i am a beginner! My problem is as follows:

I have a data file as follows:

1 x1 y1 z1
2 x2 y2 z2
3 x3 y3 z3
....

and I would like my program to read a file and arrange my coordinates as follows:

x1 y1 z1 x2 y2 z2 x3 y3 z3 ...

and then analyse it with the rest of the code that I have.

I am not quite sure how I could do this and thank for any suggestions in advance!

[CJC0117]

You could use the vector class which can hold strings as elements, but you might find it to be too complicated. I suggest reading about the vector class:

#include<vector>
#include<cstdlib>
#include<iostream>
#include<fstream>

using namespace std;

int main()
{
    int i,j=0;
    string holder;
    ifstream infile;
    infile.open("test.txt");
    vector<string>data(9,"0"); /*Declares a vector called data that hold 9 elements
of type string, and initializes each string to 0.*/
    for(i=0;i<12;i++)
    {
        infile>>holder;
        if(i%4!=0) //If i/4 has a remainder that is not equal to zero...
        {
            data[j]=holder;
            j++;
        }
    }
    for(i=0;i<9;i++)
        cout<<data[i]<<" ";
    cout<<endl<<endl;
    system("pause");
    return 0;
}

My text file looked like this:

1 x1 y1 z1
2 x2 y2 z2
3 x3 y3 z3

EDIT: If you don't want to use the vector class, you can just replace line 1 with #include<string> and line 14 with string*data=new string [9];. It achieves the same effect.