import java.util.Scanner;

public class CostPerSqFt {
  
  public static void main(String[] args) {
    final double SENTINEL = 0.0;
    double houseSize;
    int houseCost;
    double costPerSqFt;
    double totalCostPerSqFt;
    double averageCostPerSqFt;
    int houseCount;
    Scanner keyboard = new Scanner(System.in);
    
    totalCostPerSqFt = 0.0;
    houseCount = 0;
    
    System.out.println("Enter the square feet and price for each house.");
    System.out.println("Enter 0 for house size to quit.");
    
    do {
      System.out.print("Size in square feet: ");
      houseSize = keyboard.nextDouble();
      System.out.print("Cost in whole dollars: ");
      houseCost = keyboard.nextInt();
      
      if (houseSize > 0.0) {
        costPerSqFt = houseCost / houseSize;
        totalCostPerSqFt = totalCostPerSqFt = costPerSqFt;
        houseCount = houseCount + 1;
      }
    } while (houseSize != SENTINEL);
    
    if (houseCount > 0) {
      averageCostPerSqFt = totalCostPerSqFt / houseCount;
    }
    else {
      averageCostPerSqFt = 0.0;
    }
    System.out.println("Number of Houses: " + houseCount);
    System.out.println("Average cost per square foot: " + averageCostPerSqFt);
    
  }
    
}