Please explain me this code with example mainly the while loop !!!!

Question

#include <sstream>
#include <vector>
#include <iostream>
using namespace std;

vector<int> parseInts(string str) {
// Complete this function

vector<int> ret;
int a;
char ch;
stringstream s;
s.str(str);
while(!s.eof()) {
s >> a;
ret.push_back(a);
s >> ch;
}
return ret;
}

int main() {
string str;
cin >> str;
vector<int> integers = parseInts(str);
for(int i = 0; i < integers.size(); i++) {
cout << integers[i] << "\n";
}

return 0;
}

Answer 1

eof = end of file, iterate while no more element in the file, or iterate while the current element is a tag which is the end of file tag