Thread: vectors and the resize function

Hi everyone,

I am having a problem creating vectors of the correct size.

What I am doing is, reading from a file. From this file, the first 2 ints specify rows and columns of a row x col grid. I use vector of vectors to achieve this. Now, I've written this code, and it isn't giving me the desired result. When I cout to the console, it is displaying 5 rows and 40 columns when it should be displaying a 10 x 20 grid. What am I doing wrong here?

Code:

     int x;

    ifstream input;
    input.open( fileName.c_str() );

    input >> nRows;
    input >> nCols;
    
    cout << "row and columns " << nRows << nCols << endl;
    
    vals.resize(nRows);
    markedRecords.resize(nRows);


    //cout <<  "vals size " << vals.size() << endl;


    for( int i = 0; i < nRows; i++ )
    {
            vals[i].resize(nCols);
            markedRecords[i].resize(nCols);
        
        for( int j = 0; j < nCols; j++ )
        {    
            input >> x;        
            vals[i][j] = x;    
            markedRecords[i][j] = x;
            //cout << vals [i][j] << " ";
            cout << markedRecords[i][j] << " ";
        }
    }


    input.close();