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

using namespace std;

int main()     // this function has grown far too big
{ ifstream inf;
  inf.open("/home/www/class/een118/a3010b.txt");
  if (inf.fail())
  { cerr << "Can't open file\n";
    exit(1); }

  string syms[120], names[120];
  double atwts[120];
  string sym, name;
  double atwt;

  int atno = 0;
  while (true)
  { inf >> sym >> name >> atwt;
    if (inf.fail())
      break;
    atno += 1;
    syms[atno] = sym;
    names[atno] = name;
    atwts[atno] = atwt; }
  const int entries = atno;

  inf.close();
  for (atno = 1; atno <= entries; atno += 1)
    cout << atno << ", '" << syms[atno] << "', '" << names[atno]
         << "', " << atwts[atno] << "\n";

  double molwt = 0;
  int num;
  while (true)
  { cout << "> ";
    cin >> sym;
    if (cin.fail())
      break;

    for (atno = 1; atno <= entries; atno += 1)
      if (syms[atno] == sym)
        break;

    if (atno <= entries)
    { cout << "number? ";
      cin >> num;
      cout << atno << ", '" << syms[atno] << "', '" << names[atno]
           << "', " << atwts[atno] << "\n";
      molwt += atwts[atno] * num; }
    else
      cout << "'" << sym << "' not found\n"; }

  cout << "Molecular weight " << molwt << "\n"; }