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

using namespace std;

int main()
{ double molwt = 0.0;
  cout << "Enter control-d when done\n";
  ifstream elf;
  while (true)
  { elf.open("new.txt");
    if (elf.fail())
    { cout << "Can't open the file\n";
      exit(1); }
    cout << "Enter an element's symbol: ";
    string wanted;
    cin >> wanted;
    if (cin.fail())
      break;
    bool found = false;
    while (true)
    { string symbol, name;
      int atno;
      double atwt;
      elf >> symbol >> name >> atno >> atwt;
      if (elf.fail())
        break;
      if (symbol == wanted)
      { cout << "Symbol: " << symbol << "\n";
        cout << "Name " << name << "\n";
        cout << "atomic number: " << atno << "\n";
        cout << "atomic weight: " << atwt<< "\n";
        molwt += atwt;
        found = true; } }
    if (found == false)
    { cout << "Symbol " << wanted << " was not found\n";
      exit(1); }
    elf.close(); }
  cout << "\nTotal molecular weight = " << molwt << "\n"; }