skipping whitespace with istream

hello,

i have a matrix, and i need to save its contents to a file, and then load it back from the file.
i have the following code:

Code:

---

template<class T>
void Matrix<T>::write(ostream& os) const {
    for(int i=0;i<line;i++){
                for(int j=0;j<col;j++){
                        os << data[i][j] << " ";
                }
        }
}

template<class T>
void Matrix<T>::read(istream& is) {
    for(int i=0;i<line;i++){
                for(int j=0;j<col;j++){
                        is >> data[i][j];
                }
        }
}

---

so my file should look like this for example: 1 2 3 4 5
when i'm trying to load it back its not working, so i was thinking that maybe the whitespace characters are messing it up.. so how do i ignore them in the read function?

thanks.

A.

The >> operator already skips whitespace. Your code looks fine.

unfortunately when i write() it, then fill the matrix with zeros, then load it back using read() and then list it out again, its full of zeroes..

Quote:

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Originally Posted by Avraham

unfortunately when i write() it, then fill the matrix with zeros, then load it back using read() and then list it out again, its full of zeroes..

---

You'll have to show more of the surrounding code, because I don't see anything wrong in this part of it.

EDIT: You don't happen to be reading and writing from the same fstream object, are you?

Code:

---

#include "matrix.cpp"
#include <iostream>
#include <fstream>

using namespace std;

int main() {
        Matrix<int> matrix2(3,3);
        matrix2.fill();
        matrix2.list();
        ofstream ofs("Matrix.txt");
        matrix2.write(ofs);
        matrix2.zero();
        matrix2.list();
        ifstream ifs("Matrix.txt");
        matrix2.read(ifs);
        matrix2.list();
    return 0;
}

---

this is my main.cpp, am i doing it wrong?

You should close your output file before using it as input again.

its working!!! thank you guys!