public class StockProfit {
  // Determine best buy-sell period
  // Author: Max Kamin, June 24, 1997
  
  public static void main (String[] args) {
    int minPrice,   // lowest price so far
        priceToday, // last price input
        profit = 0; // best profit possible so far
   
    // Determine initial minimum price
    System.out.print("Enter value of stock : ");
    priceToday = Keyboard.readInt();
    minPrice = priceToday;
  
    // what is the next day's price?
    System.out.print("Enter value of stock : ");
    priceToday = Keyboard.readInt();
  
    while (!Keyboard.eof()) {
  
      // Does a sell today maximize profit?
      if (priceToday - minPrice > profit) 
        profit = priceToday - minPrice;
  
      // Is today a new minimum price?
      if (priceToday < minPrice)
        minPrice = priceToday;
  
      // Next day's price.
      System.out.print("Enter value of stock : ");
      priceToday = Keyboard.readInt();
    }
  
    System.out.println("Maximum profit = " + profit + 
                       " dollars.");
  }
}