lec3.1

import java.util.Scanner;

public class GasMileage {
    public void calculateGasMileage(){
        Scanner input = new Scanner(System.in);


        int tripsCount = 1;
        int totalMiles = 0;
        int totalGallons = 0;
        double avgMilesPerGallon = 0.0;

        while(true) {
            System.out.println("Enter miles or -1 to quit");
            int miles = input.nextInt();
            if(miles == -1)
                break;
            System.out.println("Enter gallons");
            int gallons = input.nextInt();
            double milesPerGallon = miles/(double)gallons;
            System.out.println("Trip " + tripsCount + " used " + milesPerGallon + " miles per gallon" );

            totalMiles = totalMiles + miles;
            totalGallons = totalGallons + gallons;

            avgMilesPerGallon = avgMilesPerGallon + totalMiles/(double)totalGallons;
            System.out.println("Miles per gallon for now " + avgMilesPerGallon );

            tripsCount++;
        }


        System.out.println("Miles per gallon for all trips " + avgMilesPerGallon );


    }
    }

public class GasMileageTest {

    public static void main(String[] args) {
        GasMileage trips = new GasMileage();

        trips.calculateGasMileage();

    }

}