170: Import data from .txt file into a 2D array


#include <iostream>
#include <fstream>
#define maxlim 10       // set what should be the maximum number of row you wanna read
using namespace std;
int main()
{
    string arr[maxlim][4];  // initializing array in which we will import data

    ifstream file;                     // it must be ifstream not fstream
    file.open("myfile.txt", ios::app);  // set file name and ios::app will not overwrite file while writing it again

    if (file.fail())        // if file does not open program will terminate
    {
        cout << "File opening filed\n";
        return 1;
    }

    int rows = 0;                  // declaring rows
    while (file.eof() == 0)         // reading file till end of file
    {
        string temp_row = "";
        getline(file, temp_row);     // take line 1 of file as input in temp_row
        if (temp_row == "")         // if it is empty row you will skip to next row
        {
            rows++;
            continue;
        }
        int column = 0;
        string temp_col = "";
        for (int j = 0; j < temp_row.length(); j++) // breaking row that we input into different values
        {
            if (temp_row[j] != ',')         // if , does not occur keep adding character in temp_row
            {
                temp_col += temp_row[j];
            }
            else                            // if , occur save temp_row into 2D array
            {
                arr[rows][column] = temp_col;
                temp_col = "";                 // empty temp_col
                column++;
            }
        }
        rows++;
        if (rows == maxlim) // if rows become equal to max limit, decrease row by one, show error message, break
        {
            rows--;
            cout << "%%%%% (Error) %%%%%%%%%%% (Maximum memory reached)%%%%%%%%%%%" << endl;
            break;
        }
    }
    file.close();   // closing file


    // Output 2D array
    for (int i = 0; i <= rows; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            cout << arr[i][j] << ' ';
        }
        cout << endl;
    }
    return 0;
}

Data:

1122,2331,3232,umar,
3334,3232,1323,usman,

4444,32323,2231,mohib,
565,232323,323,abdullah,
666,42323,233,waleed,

1122,2331,3232,waheed,
3334,3232,1323,waseem,
1122,2331,3232,naseem,
3334,3232,1323,qasim,
1122,2331,3232,shahbaz,
3334,3232,1323,najam,

Precautions:
  1. In the data and in the code, there must be a common word terminator like in above code, it is a comma (,).
  2. Ending of each line must also be word terminator or else that word will not be imported.

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