Reading file into array

[me_newbie]

Hi Guys!

i'm reading a file which has 20 rows and random number of columns, i want to put them in array/vector which i did but the problem is that array is filling a cell with a garbage value at location where i don't have a value in the data file.

suppose i have data file like following (there is tab between each column and each row has different number of columns)

20   30      10
22   10      9       3      40 
60    4
30   200     90
33   320             22

here is my code

#include <vector>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>

int main() {
     std::vector<std::vector<int> > allData;

     std::ifstream fin("data.dat");
     std::string line;
    
    while (std::getline(fin, line)) {      // for each line
            std::vector<int> lineData;           // create a new row
            int val;
            std::istringstream lineStream(line); 
    
           while (lineStream >> val) {          // for each value in line
                   lineData.push_back(val);           // add to the current row
           }
         
           allData.push_back(lineData);         // add row to allData
    }

    //std::cout << "row 0 contains " << allData[0].size() << " columns\n";
    //std::cout << "row 0, column 1 is " << allData[0][1] << '\n';
}

your help will be appreciated

Regards,
Ewa