practice-istream.cpp

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

using std::cout;  
using std::endl;

int main(int argc, char *argv[]) {
  std::ifstream ifs(argv[1]);
  std::string line, a, b;
  std::istringstream iss;
  while (std::getline(ifs, line)) {
    cout << "[" << line << "]" << endl;
    iss.clear();  
    iss.str(line);
    const bool aOk = (iss >> a);
    cout << (aOk ? "GOOD" : " bad") << endl;
    const bool bOk = (iss >> b);
    cout << (bOk ? "GOOD" : " bad") << endl;
    cout << (iss.good() ? "GOOD" : " bad") << endl;
    cout << "[" << a << "]" << ", " << "[" << b << "]" << endl;
  }
}