Inputing from file to parallel arrays

AaronB (1)
I am trying to write a function that will input from a file to parallel arrays. i have a file that contains 4 columns of information and an unknown number of rows. I want to input each column into an array and return the total number of elements in an array
file looks like

3 12345 1 15.95
2 67800 3 50.00
4 32145 2 4.50
6 98765 1 75.00

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int buildArrays( int ar1[], int ar2[], int ar3[], double ar4[] )
{
  
  ifstream infile;
  //Open the input file. If it fails to open, display an error message and
  //end the program
  infile.open( "data.txt" );
  if( infile.fail() )
     {
         cout << "data.txt failed to open";
         exit( -1 );
     }   
  int numElements = 0;
  int num;
  infile >> num;
  while (!infile.eof())
    {
        ar1 [numElements] = num;
        infile >> num;
        ar2 [numElements] = num;
        infile >> num;
        ar3 [numElements] = num;
        infile >> num;
        ar4 [numSales] = ( double ) num;
        numElements++;
        infile >> num;
    }
  infile.close();
  return numElements;  
}

Last edited on
hamsterman (4538)
Are you having any problems with that?

Also, a little suggestion:
instead of
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  infile >> num;
  while (!infile.eof())
    {
        ar1 [numElements] = num;
        infile >> num;
        ar2 [numElements] = num;
        infile >> num;
        ar3 [numElements] = num;
        infile >> num;
        ar4 [numSales] = ( double ) num;
        numElements++;
        infile >> num;
    }
, why not write
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while (!infile.eof()){
        infile >> ar1 [numElements];
        infile >> ar2 [numElements];
        infile >> ar3 [numElements];
        infile >>  ar4 [numSales];

        numElements++;
    }

Is NumSales a global?
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