Reading lines of different sizes?

[dn90]

data.txt

1 2 7 4 123 5 6
2 1 1.5
3 2 50 4 50.2
4
5 2 10.5 3 13.9

My code:

#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib>

using namespace std; 

int main(int argc, char **argv) {
 ifstream file(data.txt);
 string data;
 vector<string> theData;

 if (!file) {
    cout << "Could not open file." << endl;
    exit(1);
 }

 while(file >> data) {
 	if (data == '\n') {
 		for (int i = 0; i < theData.size(); i++) {
 			cout << theData[i] << " ";
 		}
 		cout << "------------" << endl;
 		theData.clear();
 		continue;
 	}
 	theData.push_back(data);
 }

 file.close();

 return 0;
}

My intended output is:

1 2 7 4 123 5 6
-------------
2 1 1.5
-------------
3 2 50 4 50.2
-------------
4
-------------
5 2 10.5 3 13.9
-------------

I know that the problem is at " if (data == '\n') " but how can I resolve this? I want to treat each individual integer of each line as a separate entity (so I can use the vector for some other methods and then I'll clear it for the next line). Each line size varies.

[Chervil]

If you are interested in the contents of each line, read a whole line at a time.
Then use a stringstream to parse the contents of the line.

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

int main()
{
    std::ifstream file("data.txt");
    std::string line;
    
    while (getline(file, line))
    {
        std::istringstream ss(line);
        double num;
        while (ss >> num)
            std::cout << std::setw(6) << num;
        std::cout << '\n';
    }   
}

Output:

     1     2     7     4   123     5     6
     2     1   1.5
     3     2    50     4  50.2
     4
     5     2  10.5     3  13.9